76 files changed, 1484 insertions, 1484 deletions

diff --git a/src/LambdaCube/Compiler/DesugaredSource.hs b/src/LambdaCube/Compiler/DesugaredSource.hs
index 9711166e..672fb2dc 100644
--- a/src/LambdaCube/Compiler/DesugaredSource.hs
+++ b/src/LambdaCube/Compiler/DesugaredSource.hs
@@ -527,7 +527,7 @@ renderDocX = render . addPar (-10) . flip runReader [] . flip evalStateT (flip (
         DLam lam vs arr e -> DLam lam <$> (mapM showVars vs) <*> pure arr <*> showVars e
       where
         lookupVarName i xs | i < length xs && i >= 0 = xs !! i
-        lookupVarName i _ = "V" ++ show i -- TODO: better names here
+        lookupVarName i _ = ((\s n -> n: '_': s) <$> iterate ('\'':) "" <*> ['a'..'z']) !! i
 
     addPar :: Int -> NDoc -> NDoc
     addPar pr x = case x of
diff --git a/testdata/Builtins.out b/testdata/Builtins.out
index a6cf15f7..07783eca 100644
--- a/testdata/Builtins.out
+++ b/testdata/Builtins.out
@@ -392,14 +392,14 @@ texture2D :: 'Sampler -> 'Vec 2 'Float -> 'Vec 4 'Float
 accumulationContext :: {a} -> a->a
 ------------ tooltips
 testdata/Builtins.lc 10:1-10:3  {a} -> a->a
-testdata/Builtins.lc 10:8-10:9  V1
+testdata/Builtins.lc 10:8-10:9  b_
 testdata/Builtins.lc 14:6-14:10  Type | Type -> Nat->Type
 testdata/Builtins.lc 14:6-17:37  Type
 testdata/Builtins.lc 14:17-14:21  Type
 testdata/Builtins.lc 14:26-14:29  Type
 testdata/Builtins.lc 14:26-14:37  Type
 testdata/Builtins.lc 14:33-14:37  Type
-testdata/Builtins.lc 15:3-15:5  VecS V3 2 | {a} -> a -> a -> VecS a 2
+testdata/Builtins.lc 15:3-15:5  VecS d_ 2 | {a} -> a -> a -> VecS a 2
 testdata/Builtins.lc 15:3-15:27  Type
 testdata/Builtins.lc 15:9-15:10  Type
 testdata/Builtins.lc 15:9-15:27  Type
@@ -409,8 +409,8 @@ testdata/Builtins.lc 15:19-15:23  Type -> Nat->Type
 testdata/Builtins.lc 15:19-15:25  Nat->Type
 testdata/Builtins.lc 15:19-15:27  Type
 testdata/Builtins.lc 15:24-15:25  Type
-testdata/Builtins.lc 15:26-15:27  V1
-testdata/Builtins.lc 16:3-16:5  VecS V5 3 | {a} -> a -> a -> a -> VecS a 3
+testdata/Builtins.lc 15:26-15:27  b_
+testdata/Builtins.lc 16:3-16:5  VecS f_ 3 | {a} -> a -> a -> a -> VecS a 3
 testdata/Builtins.lc 16:3-16:32  Type
 testdata/Builtins.lc 16:9-16:10  Type
 testdata/Builtins.lc 16:9-16:32  Type
@@ -422,8 +422,8 @@ testdata/Builtins.lc 16:24-16:28  Type -> Nat->Type
 testdata/Builtins.lc 16:24-16:30  Nat->Type
 testdata/Builtins.lc 16:24-16:32  Type
 testdata/Builtins.lc 16:29-16:30  Type
-testdata/Builtins.lc 16:31-16:32  V1
-testdata/Builtins.lc 17:3-17:5  VecS V7 4 | {a} -> a -> a -> a -> a -> VecS a 4
+testdata/Builtins.lc 16:31-16:32  b_
+testdata/Builtins.lc 17:3-17:5  VecS h_ 4 | {a} -> a -> a -> a -> a -> VecS a 4
 testdata/Builtins.lc 17:3-17:37  Type
 testdata/Builtins.lc 17:9-17:10  Type
 testdata/Builtins.lc 17:9-17:37  Type
@@ -437,16 +437,16 @@ testdata/Builtins.lc 17:29-17:33  Type -> Nat->Type
 testdata/Builtins.lc 17:29-17:35  Nat->Type
 testdata/Builtins.lc 17:29-17:37  Type
 testdata/Builtins.lc 17:34-17:35  Type
-testdata/Builtins.lc 17:36-17:37  V1
+testdata/Builtins.lc 17:36-17:37  b_
 testdata/Builtins.lc 19:11-19:43  Type
-testdata/Builtins.lc 19:12-19:13  V5
-testdata/Builtins.lc 19:17-19:18  Type | V4
+testdata/Builtins.lc 19:12-19:13  f_
+testdata/Builtins.lc 19:17-19:18  Type | e_
 testdata/Builtins.lc 19:23-19:27  Type -> Nat->Type
 testdata/Builtins.lc 19:23-19:29  Nat->Type
 testdata/Builtins.lc 19:23-19:31  Type
 testdata/Builtins.lc 19:23-19:43  Type
 testdata/Builtins.lc 19:28-19:29  Type
-testdata/Builtins.lc 19:30-19:31  V2
+testdata/Builtins.lc 19:30-19:31  c_
 testdata/Builtins.lc 19:35-19:39  Type -> Nat->Type
 testdata/Builtins.lc 19:35-19:41  Nat->Type
 testdata/Builtins.lc 19:35-19:43  Type
@@ -454,46 +454,46 @@ testdata/Builtins.lc 19:40-19:41  Type
 testdata/Builtins.lc 19:42-19:43  Nat
 testdata/Builtins.lc 20:1-20:7  {a} -> {b} -> {c:Nat} -> a->b -> VecS a c -> VecS b c
 testdata/Builtins.lc 20:21-20:23  {a} -> a -> a -> VecS a 2
-testdata/Builtins.lc 20:21-20:29  V5 -> VecS V6 2
-testdata/Builtins.lc 20:21-20:35  V0 -> V1 -> VecS V6 2 | V1 -> VecS V6 2 | VecS V5 2
-testdata/Builtins.lc 20:21-21:43  (V4 -> V5 -> V6 -> V7 -> VecS V7 4) -> {a:Nat} -> VecS V6 a -> VecS V6 a
-testdata/Builtins.lc 20:21-22:51  V2->V2 -> VecS V3 V1 -> VecS V3 V2 | VecS V3 V1 -> VecS V3 V2 | {a:Nat} -> VecS V5 a -> VecS V5 a
-testdata/Builtins.lc 20:25-20:26  V8->V8
-testdata/Builtins.lc 20:25-20:28  V5
-testdata/Builtins.lc 20:27-20:28  V2
-testdata/Builtins.lc 20:31-20:32  V6->V6
-testdata/Builtins.lc 20:31-20:34  V5
-testdata/Builtins.lc 20:33-20:34  V6
+testdata/Builtins.lc 20:21-20:29  f_ -> VecS g_ 2
+testdata/Builtins.lc 20:21-20:35  VecS f_ 2 | a_ -> b_ -> VecS g_ 2 | b_ -> VecS g_ 2
+testdata/Builtins.lc 20:21-21:43  (e_ -> f_ -> g_ -> h_ -> VecS h_ 4) -> {a:Nat} -> VecS g_ a -> VecS g_ a
+testdata/Builtins.lc 20:21-22:51  VecS d_ b_ -> VecS d_ c_ | c_->c_ -> VecS d_ b_ -> VecS d_ c_ | {a:Nat} -> VecS f_ a -> VecS f_ a
+testdata/Builtins.lc 20:25-20:26  i_->i_
+testdata/Builtins.lc 20:25-20:28  f_
+testdata/Builtins.lc 20:27-20:28  c_
+testdata/Builtins.lc 20:31-20:32  g_->g_
+testdata/Builtins.lc 20:31-20:34  f_
+testdata/Builtins.lc 20:33-20:34  g_
 testdata/Builtins.lc 21:23-21:25  {a} -> a -> a -> a -> VecS a 3
-testdata/Builtins.lc 21:23-21:31  V6 -> V7 -> VecS V8 3
-testdata/Builtins.lc 21:23-21:37  V6 -> VecS V7 3
-testdata/Builtins.lc 21:23-21:43  V4 -> V5 -> V6 -> VecS V6 3 | V5 -> V6 -> VecS V6 3 | V6 -> VecS V6 3 | VecS V6 3
-testdata/Builtins.lc 21:27-21:28  V8->V8
-testdata/Builtins.lc 21:27-21:30  V6
-testdata/Builtins.lc 21:29-21:30  V7
-testdata/Builtins.lc 21:33-21:34  V7->V7
-testdata/Builtins.lc 21:33-21:36  V6
-testdata/Builtins.lc 21:35-21:36  V7
-testdata/Builtins.lc 21:39-21:40  V7->V7
-testdata/Builtins.lc 21:39-21:42  V6
-testdata/Builtins.lc 21:41-21:42  V7
+testdata/Builtins.lc 21:23-21:31  g_ -> h_ -> VecS i_ 3
+testdata/Builtins.lc 21:23-21:37  g_ -> VecS h_ 3
+testdata/Builtins.lc 21:23-21:43  VecS g_ 3 | e_ -> f_ -> g_ -> VecS g_ 3 | f_ -> g_ -> VecS g_ 3 | g_ -> VecS g_ 3
+testdata/Builtins.lc 21:27-21:28  i_->i_
+testdata/Builtins.lc 21:27-21:30  g_
+testdata/Builtins.lc 21:29-21:30  h_
+testdata/Builtins.lc 21:33-21:34  h_->h_
+testdata/Builtins.lc 21:33-21:36  g_
+testdata/Builtins.lc 21:35-21:36  h_
+testdata/Builtins.lc 21:39-21:40  h_->h_
+testdata/Builtins.lc 21:39-21:42  g_
+testdata/Builtins.lc 21:41-21:42  h_
 testdata/Builtins.lc 22:25-22:27  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Builtins.lc 22:25-22:33  V7 -> V8 -> V9 -> VecS V10 4
-testdata/Builtins.lc 22:25-22:39  V7 -> V8 -> VecS V9 4
-testdata/Builtins.lc 22:25-22:45  V7 -> VecS V8 4
-testdata/Builtins.lc 22:25-22:51  V4 -> V5 -> V6 -> V7 -> VecS V7 4 | V5 -> V6 -> V7 -> VecS V7 4 | V6 -> V7 -> VecS V7 4 | V7 -> VecS V7 4 | VecS V7 4
-testdata/Builtins.lc 22:29-22:30  V9->V9
-testdata/Builtins.lc 22:29-22:32  V7
-testdata/Builtins.lc 22:31-22:32  V8
-testdata/Builtins.lc 22:35-22:36  V8->V8
-testdata/Builtins.lc 22:35-22:38  V7
-testdata/Builtins.lc 22:37-22:38  V8
-testdata/Builtins.lc 22:41-22:42  V8->V8
-testdata/Builtins.lc 22:41-22:44  V7
-testdata/Builtins.lc 22:43-22:44  V8
-testdata/Builtins.lc 22:47-22:48  V8->V8
-testdata/Builtins.lc 22:47-22:50  V7
-testdata/Builtins.lc 22:49-22:50  V8
+testdata/Builtins.lc 22:25-22:33  h_ -> i_ -> j_ -> VecS k_ 4
+testdata/Builtins.lc 22:25-22:39  h_ -> i_ -> VecS j_ 4
+testdata/Builtins.lc 22:25-22:45  h_ -> VecS i_ 4
+testdata/Builtins.lc 22:25-22:51  VecS h_ 4 | e_ -> f_ -> g_ -> h_ -> VecS h_ 4 | f_ -> g_ -> h_ -> VecS h_ 4 | g_ -> h_ -> VecS h_ 4 | h_ -> VecS h_ 4
+testdata/Builtins.lc 22:29-22:30  j_->j_
+testdata/Builtins.lc 22:29-22:32  h_
+testdata/Builtins.lc 22:31-22:32  i_
+testdata/Builtins.lc 22:35-22:36  i_->i_
+testdata/Builtins.lc 22:35-22:38  h_
+testdata/Builtins.lc 22:37-22:38  i_
+testdata/Builtins.lc 22:41-22:42  i_->i_
+testdata/Builtins.lc 22:41-22:44  h_
+testdata/Builtins.lc 22:43-22:44  i_
+testdata/Builtins.lc 22:47-22:48  i_->i_
+testdata/Builtins.lc 22:47-22:50  h_
+testdata/Builtins.lc 22:49-22:50  i_
 testdata/Builtins.lc 24:23-24:26  Type
 testdata/Builtins.lc 24:37-24:40  Nat -> Type->Type
 testdata/Builtins.lc 24:47-24:51  Type -> Nat->Type
@@ -527,252 +527,252 @@ testdata/Builtins.lc 33:3-33:54  Type
 testdata/Builtins.lc 33:11-33:14  Nat -> Type->Type
 testdata/Builtins.lc 33:11-33:16  Type->Type
 testdata/Builtins.lc 33:11-33:22  Type
-testdata/Builtins.lc 33:15-33:16  V1
+testdata/Builtins.lc 33:15-33:16  b_
 testdata/Builtins.lc 33:17-33:22  Type
 testdata/Builtins.lc 33:26-33:29  Nat -> Type->Type
 testdata/Builtins.lc 33:26-33:31  Type->Type
 testdata/Builtins.lc 33:26-33:37  Type
 testdata/Builtins.lc 33:26-33:54  Type
-testdata/Builtins.lc 33:30-33:31  V1
+testdata/Builtins.lc 33:30-33:31  b_
 testdata/Builtins.lc 33:32-33:37  Type
 testdata/Builtins.lc 33:41-33:44  Nat -> Nat -> Type->Type
 testdata/Builtins.lc 33:41-33:46  Nat -> Type->Type
 testdata/Builtins.lc 33:41-33:48  Type->Type
 testdata/Builtins.lc 33:41-33:54  Type
-testdata/Builtins.lc 33:45-33:46  V1
+testdata/Builtins.lc 33:45-33:46  b_
 testdata/Builtins.lc 33:45-33:48  a:Type -> Mat 2 2 a -> Type
 testdata/Builtins.lc 33:45-33:54  Mat 2 2 Float -> Type
-testdata/Builtins.lc 33:47-33:48  V1
+testdata/Builtins.lc 33:47-33:48  b_
 testdata/Builtins.lc 33:49-33:54  Type
 testdata/Builtins.lc 34:3-34:7  Mat 3 2 Float | Vec 3 Float -> Vec 3 Float -> Mat 3 2 Float
 testdata/Builtins.lc 34:3-34:54  Type
 testdata/Builtins.lc 34:11-34:14  Nat -> Type->Type
 testdata/Builtins.lc 34:11-34:16  Type->Type
 testdata/Builtins.lc 34:11-34:22  Type
-testdata/Builtins.lc 34:15-34:16  V1
+testdata/Builtins.lc 34:15-34:16  b_
 testdata/Builtins.lc 34:17-34:22  Type
 testdata/Builtins.lc 34:26-34:29  Nat -> Type->Type
 testdata/Builtins.lc 34:26-34:31  Type->Type
 testdata/Builtins.lc 34:26-34:37  Type
 testdata/Builtins.lc 34:26-34:54  Type
-testdata/Builtins.lc 34:30-34:31  V1
+testdata/Builtins.lc 34:30-34:31  b_
 testdata/Builtins.lc 34:32-34:37  Type
 testdata/Builtins.lc 34:41-34:44  Nat -> Nat -> Type->Type
 testdata/Builtins.lc 34:41-34:46  Nat -> Type->Type
 testdata/Builtins.lc 34:41-34:48  Type->Type
 testdata/Builtins.lc 34:41-34:54  Type
-testdata/Builtins.lc 34:45-34:46  V1
+testdata/Builtins.lc 34:45-34:46  b_
 testdata/Builtins.lc 34:45-34:48  a:Type -> Mat 3 2 a -> Type
 testdata/Builtins.lc 34:45-34:54  Mat 3 2 Float -> Type
-testdata/Builtins.lc 34:47-34:48  V1
+testdata/Builtins.lc 34:47-34:48  b_
 testdata/Builtins.lc 34:49-34:54  Type
 testdata/Builtins.lc 35:3-35:7  Mat 4 2 Float | Vec 4 Float -> Vec 4 Float -> Mat 4 2 Float
 testdata/Builtins.lc 35:3-35:54  Type
 testdata/Builtins.lc 35:11-35:14  Nat -> Type->Type
 testdata/Builtins.lc 35:11-35:16  Type->Type
 testdata/Builtins.lc 35:11-35:22  Type
-testdata/Builtins.lc 35:15-35:16  V1
+testdata/Builtins.lc 35:15-35:16  b_
 testdata/Builtins.lc 35:17-35:22  Type
 testdata/Builtins.lc 35:26-35:29  Nat -> Type->Type
 testdata/Builtins.lc 35:26-35:31  Type->Type
 testdata/Builtins.lc 35:26-35:37  Type
 testdata/Builtins.lc 35:26-35:54  Type
-testdata/Builtins.lc 35:30-35:31  V1
+testdata/Builtins.lc 35:30-35:31  b_
 testdata/Builtins.lc 35:32-35:37  Type
 testdata/Builtins.lc 35:41-35:44  Nat -> Nat -> Type->Type
 testdata/Builtins.lc 35:41-35:46  Nat -> Type->Type
 testdata/Builtins.lc 35:41-35:48  Type->Type
 testdata/Builtins.lc 35:41-35:54  Type
-testdata/Builtins.lc 35:45-35:46  V1
+testdata/Builtins.lc 35:45-35:46  b_
 testdata/Builtins.lc 35:45-35:48  a:Type -> Mat 4 2 a -> Type
 testdata/Builtins.lc 35:45-35:54  Mat 4 2 Float -> Type
-testdata/Builtins.lc 35:47-35:48  V1
+testdata/Builtins.lc 35:47-35:48  b_
 testdata/Builtins.lc 35:49-35:54  Type
 testdata/Builtins.lc 36:3-36:7  Mat 2 3 Float | Vec 2 Float -> Vec 2 Float -> Vec 2 Float -> Mat 2 3 Float
 testdata/Builtins.lc 36:3-36:69  Type
 testdata/Builtins.lc 36:11-36:14  Nat -> Type->Type
 testdata/Builtins.lc 36:11-36:16  Type->Type
 testdata/Builtins.lc 36:11-36:22  Type
-testdata/Builtins.lc 36:15-36:16  V1
+testdata/Builtins.lc 36:15-36:16  b_
 testdata/Builtins.lc 36:17-36:22  Type
 testdata/Builtins.lc 36:26-36:29  Nat -> Type->Type
 testdata/Builtins.lc 36:26-36:31  Type->Type
 testdata/Builtins.lc 36:26-36:37  Type
 testdata/Builtins.lc 36:26-36:69  Type
-testdata/Builtins.lc 36:30-36:31  V1
+testdata/Builtins.lc 36:30-36:31  b_
 testdata/Builtins.lc 36:32-36:37  Type
 testdata/Builtins.lc 36:41-36:44  Nat -> Type->Type
 testdata/Builtins.lc 36:41-36:46  Type->Type
 testdata/Builtins.lc 36:41-36:52  Type
 testdata/Builtins.lc 36:41-36:69  Type
-testdata/Builtins.lc 36:45-36:46  V1
+testdata/Builtins.lc 36:45-36:46  b_
 testdata/Builtins.lc 36:47-36:52  Type
 testdata/Builtins.lc 36:56-36:59  Nat -> Nat -> Type->Type
 testdata/Builtins.lc 36:56-36:61  Nat -> Type->Type
 testdata/Builtins.lc 36:56-36:63  Type->Type
 testdata/Builtins.lc 36:56-36:69  Type
-testdata/Builtins.lc 36:60-36:61  V1
+testdata/Builtins.lc 36:60-36:61  b_
 testdata/Builtins.lc 36:60-36:63  a:Type -> Mat 2 3 a -> Type
 testdata/Builtins.lc 36:60-36:69  Mat 2 3 Float -> Type
-testdata/Builtins.lc 36:62-36:63  V1
+testdata/Builtins.lc 36:62-36:63  b_
 testdata/Builtins.lc 36:64-36:69  Type
 testdata/Builtins.lc 37:3-37:7  Mat 3 3 Float | Vec 3 Float -> Vec 3 Float -> Vec 3 Float -> Mat 3 3 Float
 testdata/Builtins.lc 37:3-37:69  Type
 testdata/Builtins.lc 37:11-37:14  Nat -> Type->Type
 testdata/Builtins.lc 37:11-37:16  Type->Type
 testdata/Builtins.lc 37:11-37:22  Type
-testdata/Builtins.lc 37:15-37:16  V1
+testdata/Builtins.lc 37:15-37:16  b_
 testdata/Builtins.lc 37:17-37:22  Type
 testdata/Builtins.lc 37:26-37:29  Nat -> Type->Type
 testdata/Builtins.lc 37:26-37:31  Type->Type
 testdata/Builtins.lc 37:26-37:37  Type
 testdata/Builtins.lc 37:26-37:69  Type
-testdata/Builtins.lc 37:30-37:31  V1
+testdata/Builtins.lc 37:30-37:31  b_
 testdata/Builtins.lc 37:32-37:37  Type
 testdata/Builtins.lc 37:41-37:44  Nat -> Type->Type
 testdata/Builtins.lc 37:41-37:46  Type->Type
 testdata/Builtins.lc 37:41-37:52  Type
 testdata/Builtins.lc 37:41-37:69  Type
-testdata/Builtins.lc 37:45-37:46  V1
+testdata/Builtins.lc 37:45-37:46  b_
 testdata/Builtins.lc 37:47-37:52  Type
 testdata/Builtins.lc 37:56-37:59  Nat -> Nat -> Type->Type
 testdata/Builtins.lc 37:56-37:61  Nat -> Type->Type
 testdata/Builtins.lc 37:56-37:63  Type->Type
 testdata/Builtins.lc 37:56-37:69  Type
-testdata/Builtins.lc 37:60-37:61  V1
+testdata/Builtins.lc 37:60-37:61  b_
 testdata/Builtins.lc 37:60-37:63  a:Type -> Mat 3 3 a -> Type
 testdata/Builtins.lc 37:60-37:69  Mat 3 3 Float -> Type
-testdata/Builtins.lc 37:62-37:63  V1
+testdata/Builtins.lc 37:62-37:63  b_
 testdata/Builtins.lc 37:64-37:69  Type
 testdata/Builtins.lc 38:3-38:7  Mat 4 3 Float | Vec 4 Float -> Vec 4 Float -> Vec 4 Float -> Mat 4 3 Float
 testdata/Builtins.lc 38:3-38:69  Type
 testdata/Builtins.lc 38:11-38:14  Nat -> Type->Type
 testdata/Builtins.lc 38:11-38:16  Type->Type
 testdata/Builtins.lc 38:11-38:22  Type
-testdata/Builtins.lc 38:15-38:16  V1
+testdata/Builtins.lc 38:15-38:16  b_
 testdata/Builtins.lc 38:17-38:22  Type
 testdata/Builtins.lc 38:26-38:29  Nat -> Type->Type
 testdata/Builtins.lc 38:26-38:31  Type->Type
 testdata/Builtins.lc 38:26-38:37  Type
 testdata/Builtins.lc 38:26-38:69  Type
-testdata/Builtins.lc 38:30-38:31  V1
+testdata/Builtins.lc 38:30-38:31  b_
 testdata/Builtins.lc 38:32-38:37  Type
 testdata/Builtins.lc 38:41-38:44  Nat -> Type->Type
 testdata/Builtins.lc 38:41-38:46  Type->Type
 testdata/Builtins.lc 38:41-38:52  Type
 testdata/Builtins.lc 38:41-38:69  Type
-testdata/Builtins.lc 38:45-38:46  V1
+testdata/Builtins.lc 38:45-38:46  b_
 testdata/Builtins.lc 38:47-38:52  Type
 testdata/Builtins.lc 38:56-38:59  Nat -> Nat -> Type->Type
 testdata/Builtins.lc 38:56-38:61  Nat -> Type->Type
 testdata/Builtins.lc 38:56-38:63  Type->Type
 testdata/Builtins.lc 38:56-38:69  Type
-testdata/Builtins.lc 38:60-38:61  V1
+testdata/Builtins.lc 38:60-38:61  b_
 testdata/Builtins.lc 38:60-38:63  a:Type -> Mat 4 3 a -> Type
 testdata/Builtins.lc 38:60-38:69  Mat 4 3 Float -> Type
-testdata/Builtins.lc 38:62-38:63  V1
+testdata/Builtins.lc 38:62-38:63  b_
 testdata/Builtins.lc 38:64-38:69  Type
 testdata/Builtins.lc 39:3-39:7  Mat 2 4 Float | Vec 2 Float -> Vec 2 Float -> Vec 2 Float -> Vec 2 Float -> Mat 2 4 Float
 testdata/Builtins.lc 39:3-39:84  Type
 testdata/Builtins.lc 39:11-39:14  Nat -> Type->Type
 testdata/Builtins.lc 39:11-39:16  Type->Type
 testdata/Builtins.lc 39:11-39:22  Type
-testdata/Builtins.lc 39:15-39:16  V1
+testdata/Builtins.lc 39:15-39:16  b_
 testdata/Builtins.lc 39:17-39:22  Type
 testdata/Builtins.lc 39:26-39:29  Nat -> Type->Type
 testdata/Builtins.lc 39:26-39:31  Type->Type
 testdata/Builtins.lc 39:26-39:37  Type
 testdata/Builtins.lc 39:26-39:84  Type
-testdata/Builtins.lc 39:30-39:31  V1
+testdata/Builtins.lc 39:30-39:31  b_
 testdata/Builtins.lc 39:32-39:37  Type
 testdata/Builtins.lc 39:41-39:44  Nat -> Type->Type
 testdata/Builtins.lc 39:41-39:46  Type->Type
 testdata/Builtins.lc 39:41-39:52  Type
 testdata/Builtins.lc 39:41-39:84  Type
-testdata/Builtins.lc 39:45-39:46  V1
+testdata/Builtins.lc 39:45-39:46  b_
 testdata/Builtins.lc 39:47-39:52  Type
 testdata/Builtins.lc 39:56-39:59  Nat -> Type->Type
 testdata/Builtins.lc 39:56-39:61  Type->Type
 testdata/Builtins.lc 39:56-39:67  Type
 testdata/Builtins.lc 39:56-39:84  Type
-testdata/Builtins.lc 39:60-39:61  V1
+testdata/Builtins.lc 39:60-39:61  b_
 testdata/Builtins.lc 39:62-39:67  Type
 testdata/Builtins.lc 39:71-39:74  Nat -> Nat -> Type->Type
 testdata/Builtins.lc 39:71-39:76  Nat -> Type->Type
 testdata/Builtins.lc 39:71-39:78  Type->Type
 testdata/Builtins.lc 39:71-39:84  Type
-testdata/Builtins.lc 39:75-39:76  V1
+testdata/Builtins.lc 39:75-39:76  b_
 testdata/Builtins.lc 39:75-39:78  a:Type -> Mat 2 4 a -> Type
 testdata/Builtins.lc 39:75-39:84  Mat 2 4 Float -> Type
-testdata/Builtins.lc 39:77-39:78  V1
+testdata/Builtins.lc 39:77-39:78  b_
 testdata/Builtins.lc 39:79-39:84  Type
 testdata/Builtins.lc 40:3-40:7  Mat 3 4 Float | Vec 3 Float -> Vec 3 Float -> Vec 3 Float -> Vec 3 Float -> Mat 3 4 Float
 testdata/Builtins.lc 40:3-40:84  Type
 testdata/Builtins.lc 40:11-40:14  Nat -> Type->Type
 testdata/Builtins.lc 40:11-40:16  Type->Type
 testdata/Builtins.lc 40:11-40:22  Type
-testdata/Builtins.lc 40:15-40:16  V1
+testdata/Builtins.lc 40:15-40:16  b_
 testdata/Builtins.lc 40:17-40:22  Type
 testdata/Builtins.lc 40:26-40:29  Nat -> Type->Type
 testdata/Builtins.lc 40:26-40:31  Type->Type
 testdata/Builtins.lc 40:26-40:37  Type
 testdata/Builtins.lc 40:26-40:84  Type
-testdata/Builtins.lc 40:30-40:31  V1
+testdata/Builtins.lc 40:30-40:31  b_
 testdata/Builtins.lc 40:32-40:37  Type
 testdata/Builtins.lc 40:41-40:44  Nat -> Type->Type
 testdata/Builtins.lc 40:41-40:46  Type->Type
 testdata/Builtins.lc 40:41-40:52  Type
 testdata/Builtins.lc 40:41-40:84  Type
-testdata/Builtins.lc 40:45-40:46  V1
+testdata/Builtins.lc 40:45-40:46  b_
 testdata/Builtins.lc 40:47-40:52  Type
 testdata/Builtins.lc 40:56-40:59  Nat -> Type->Type
 testdata/Builtins.lc 40:56-40:61  Type->Type
 testdata/Builtins.lc 40:56-40:67  Type
 testdata/Builtins.lc 40:56-40:84  Type
-testdata/Builtins.lc 40:60-40:61  V1
+testdata/Builtins.lc 40:60-40:61  b_
 testdata/Builtins.lc 40:62-40:67  Type
 testdata/Builtins.lc 40:71-40:74  Nat -> Nat -> Type->Type
 testdata/Builtins.lc 40:71-40:76  Nat -> Type->Type
 testdata/Builtins.lc 40:71-40:78  Type->Type
 testdata/Builtins.lc 40:71-40:84  Type
-testdata/Builtins.lc 40:75-40:76  V1
+testdata/Builtins.lc 40:75-40:76  b_
 testdata/Builtins.lc 40:75-40:78  a:Type -> Mat 3 4 a -> Type
 testdata/Builtins.lc 40:75-40:84  Mat 3 4 Float -> Type
-testdata/Builtins.lc 40:77-40:78  V1
+testdata/Builtins.lc 40:77-40:78  b_
 testdata/Builtins.lc 40:79-40:84  Type
 testdata/Builtins.lc 41:3-41:7  Mat 4 4 Float | Vec 4 Float -> Vec 4 Float -> Vec 4 Float -> Vec 4 Float -> Mat 4 4 Float
 testdata/Builtins.lc 41:3-41:84  Type
 testdata/Builtins.lc 41:11-41:14  Nat -> Type->Type
 testdata/Builtins.lc 41:11-41:16  Type->Type
 testdata/Builtins.lc 41:11-41:22  Type
-testdata/Builtins.lc 41:15-41:16  V1
+testdata/Builtins.lc 41:15-41:16  b_
 testdata/Builtins.lc 41:17-41:22  Type
 testdata/Builtins.lc 41:26-41:29  Nat -> Type->Type
 testdata/Builtins.lc 41:26-41:31  Type->Type
 testdata/Builtins.lc 41:26-41:37  Type
 testdata/Builtins.lc 41:26-41:84  Type
-testdata/Builtins.lc 41:30-41:31  V1
+testdata/Builtins.lc 41:30-41:31  b_
 testdata/Builtins.lc 41:32-41:37  Type
 testdata/Builtins.lc 41:41-41:44  Nat -> Type->Type
 testdata/Builtins.lc 41:41-41:46  Type->Type
 testdata/Builtins.lc 41:41-41:52  Type
 testdata/Builtins.lc 41:41-41:84  Type
-testdata/Builtins.lc 41:45-41:46  V1
+testdata/Builtins.lc 41:45-41:46  b_
 testdata/Builtins.lc 41:47-41:52  Type
 testdata/Builtins.lc 41:56-41:59  Nat -> Type->Type
 testdata/Builtins.lc 41:56-41:61  Type->Type
 testdata/Builtins.lc 41:56-41:67  Type
 testdata/Builtins.lc 41:56-41:84  Type
-testdata/Builtins.lc 41:60-41:61  V1
+testdata/Builtins.lc 41:60-41:61  b_
 testdata/Builtins.lc 41:62-41:67  Type
 testdata/Builtins.lc 41:71-41:74  Nat -> Nat -> Type->Type
 testdata/Builtins.lc 41:71-41:76  Nat -> Type->Type
 testdata/Builtins.lc 41:71-41:78  Type->Type
 testdata/Builtins.lc 41:71-41:84  Type
-testdata/Builtins.lc 41:75-41:76  V1
+testdata/Builtins.lc 41:75-41:76  b_
 testdata/Builtins.lc 41:75-41:78  a:Type -> Mat 4 4 a -> Type
 testdata/Builtins.lc 41:75-41:84  Mat 4 4 Float -> Type
-testdata/Builtins.lc 41:77-41:78  V1
+testdata/Builtins.lc 41:77-41:78  b_
 testdata/Builtins.lc 41:79-41:84  Type
 testdata/Builtins.lc 44:5-44:21  Type->Type
 testdata/Builtins.lc 44:30-44:35  Type
@@ -792,34 +792,34 @@ testdata/Builtins.lc 58:3-58:7  {a} -> {_ : Component a}->a
 testdata/Builtins.lc 58:11-58:12  Type
 testdata/Builtins.lc 59:3-59:6  {a} -> {_ : Component a}->a
 testdata/Builtins.lc 59:10-59:11  Type
-testdata/Builtins.lc 62:10-62:11  V1
-testdata/Builtins.lc 62:10-89:36  V1 | {_ : Component V0}->V1 | {a} -> {_ : Component a}->a
+testdata/Builtins.lc 62:10-62:11  b_
+testdata/Builtins.lc 62:10-89:36  b_ | {_ : Component a_}->b_ | {a} -> {_ : Component a}->a
 testdata/Builtins.lc 62:15-62:18  Type
-testdata/Builtins.lc 63:9-63:10  V1
-testdata/Builtins.lc 63:9-90:31  V1 | {_ : Component V0}->V1 | {a} -> {_ : Component a}->a
+testdata/Builtins.lc 63:9-63:10  b_
+testdata/Builtins.lc 63:9-90:31  b_ | {_ : Component a_}->b_ | {a} -> {_ : Component a}->a
 testdata/Builtins.lc 63:14-63:17  Type
-testdata/Builtins.lc 65:10-65:11  V1
-testdata/Builtins.lc 65:10-89:36  V1
+testdata/Builtins.lc 65:10-65:11  b_
+testdata/Builtins.lc 65:10-89:36  b_
 testdata/Builtins.lc 65:15-65:19  Type
-testdata/Builtins.lc 66:9-66:10  V1
-testdata/Builtins.lc 66:9-90:31  V1
+testdata/Builtins.lc 66:9-66:10  b_
+testdata/Builtins.lc 66:9-90:31  b_
 testdata/Builtins.lc 66:14-66:18  Type
 testdata/Builtins.lc 68:10-68:13  Float
-testdata/Builtins.lc 68:10-89:36  V1
+testdata/Builtins.lc 68:10-89:36  b_
 testdata/Builtins.lc 69:9-69:12  Float
-testdata/Builtins.lc 69:9-90:31  V1
+testdata/Builtins.lc 69:9-90:31  b_
 testdata/Builtins.lc 71:10-71:12  {a} -> a -> a -> VecS a 2
 testdata/Builtins.lc 71:10-71:16  Float -> VecS Float 2
 testdata/Builtins.lc 71:10-71:20  VecS Float 2
 testdata/Builtins.lc 71:10-77:28  a:Nat -> VecS Float ('Succ ('Succ a)) | a:Nat -> VecS Float ('Succ a)
-testdata/Builtins.lc 71:10-89:36  VecS V1 V0 | a:Nat -> VecS V1 a | a:Type -> b:Nat -> VecS a b
+testdata/Builtins.lc 71:10-89:36  VecS b_ a_ | a:Nat -> VecS b_ a | a:Type -> b:Nat -> VecS a b
 testdata/Builtins.lc 71:13-71:16  Float
 testdata/Builtins.lc 71:17-71:20  Float
 testdata/Builtins.lc 72:9-72:11  {a} -> a -> a -> VecS a 2
 testdata/Builtins.lc 72:9-72:15  Float -> VecS Float 2
 testdata/Builtins.lc 72:9-72:19  VecS Float 2
 testdata/Builtins.lc 72:9-78:27  a:Nat -> VecS Float ('Succ ('Succ a)) | a:Nat -> VecS Float ('Succ a)
-testdata/Builtins.lc 72:9-90:31  VecS V1 V0 | a:Nat -> VecS V1 a | a:Type -> b:Nat -> VecS a b
+testdata/Builtins.lc 72:9-90:31  VecS b_ a_ | a:Nat -> VecS b_ a | a:Type -> b:Nat -> VecS a b
 testdata/Builtins.lc 72:12-72:15  Float
 testdata/Builtins.lc 72:16-72:19  Float
 testdata/Builtins.lc 74:10-74:12  {a} -> a -> a -> a -> VecS a 3
@@ -914,7 +914,7 @@ testdata/Builtins.lc 118:34-118:58  Type
 testdata/Builtins.lc 118:34-118:73  Type
 testdata/Builtins.lc 118:39-118:55  Type->Type
 testdata/Builtins.lc 118:39-118:57  Type
-testdata/Builtins.lc 118:56-118:57  V1
+testdata/Builtins.lc 118:56-118:57  b_
 testdata/Builtins.lc 118:62-118:63  Type
 testdata/Builtins.lc 118:62-118:73  Type
 testdata/Builtins.lc 118:67-118:68  Type
@@ -924,13 +924,13 @@ testdata/Builtins.lc 119:1-119:9  {a} -> {b} -> {_ : a ~ MatVecScalarElem b} ->
 testdata/Builtins.lc 119:11-119:19  {a} -> {b} -> {_ : a ~ MatVecScalarElem b} -> {_ : Num a} -> b -> a->b
 testdata/Builtins.lc 119:21-119:29  {a} -> {b} -> {_ : a ~ MatVecScalarElem b} -> {_ : Num a} -> b -> a->b
 testdata/Builtins.lc 119:34-119:80  Type
-testdata/Builtins.lc 119:35-119:36  V4
-testdata/Builtins.lc 119:35-119:38  V3->Type
+testdata/Builtins.lc 119:35-119:36  e_
+testdata/Builtins.lc 119:35-119:38  d_->Type
 testdata/Builtins.lc 119:35-119:57  Type
 testdata/Builtins.lc 119:37-119:38  {a} -> a -> a->Type
 testdata/Builtins.lc 119:39-119:55  Type->Type
 testdata/Builtins.lc 119:39-119:57  Type
-testdata/Builtins.lc 119:56-119:57  V1
+testdata/Builtins.lc 119:56-119:57  b_
 testdata/Builtins.lc 119:59-119:62  Type->Type
 testdata/Builtins.lc 119:59-119:64  Type
 testdata/Builtins.lc 119:59-119:80  Type
@@ -945,16 +945,16 @@ testdata/Builtins.lc 120:10-120:17  {a} -> {b} -> {c:Nat} -> {_ : Num a} -> {_ :
 testdata/Builtins.lc 120:34-120:75  Type
 testdata/Builtins.lc 120:35-120:38  Type->Type
 testdata/Builtins.lc 120:35-120:40  Type
-testdata/Builtins.lc 120:39-120:40  V5
-testdata/Builtins.lc 120:42-120:43  V5
-testdata/Builtins.lc 120:42-120:45  V4->Type
+testdata/Builtins.lc 120:39-120:40  f_
+testdata/Builtins.lc 120:42-120:43  f_
+testdata/Builtins.lc 120:42-120:45  e_->Type
 testdata/Builtins.lc 120:42-120:59  Type
 testdata/Builtins.lc 120:42-120:75  Type
 testdata/Builtins.lc 120:44-120:45  {a} -> a -> a->Type
 testdata/Builtins.lc 120:46-120:55  Nat -> Type->Type
 testdata/Builtins.lc 120:46-120:57  Type->Type
 testdata/Builtins.lc 120:46-120:59  Type
-testdata/Builtins.lc 120:56-120:57  V2
+testdata/Builtins.lc 120:56-120:57  c_
 testdata/Builtins.lc 120:58-120:59  Type
 testdata/Builtins.lc 120:64-120:65  Type
 testdata/Builtins.lc 120:64-120:75  Type
@@ -966,16 +966,16 @@ testdata/Builtins.lc 121:11-121:19  {a} -> {b} -> {c:Nat} -> {_ : Num a} -> {_ :
 testdata/Builtins.lc 121:34-121:75  Type
 testdata/Builtins.lc 121:35-121:38  Type->Type
 testdata/Builtins.lc 121:35-121:40  Type
-testdata/Builtins.lc 121:39-121:40  V5
-testdata/Builtins.lc 121:42-121:43  V5
-testdata/Builtins.lc 121:42-121:45  V4->Type
+testdata/Builtins.lc 121:39-121:40  f_
+testdata/Builtins.lc 121:42-121:43  f_
+testdata/Builtins.lc 121:42-121:45  e_->Type
 testdata/Builtins.lc 121:42-121:59  Type
 testdata/Builtins.lc 121:42-121:75  Type
 testdata/Builtins.lc 121:44-121:45  {a} -> a -> a->Type
 testdata/Builtins.lc 121:46-121:55  Nat -> Type->Type
 testdata/Builtins.lc 121:46-121:57  Type->Type
 testdata/Builtins.lc 121:46-121:59  Type
-testdata/Builtins.lc 121:56-121:57  V2
+testdata/Builtins.lc 121:56-121:57  c_
 testdata/Builtins.lc 121:58-121:59  Type
 testdata/Builtins.lc 121:64-121:65  Type
 testdata/Builtins.lc 121:64-121:75  Type
@@ -988,7 +988,7 @@ testdata/Builtins.lc 122:34-122:61  Type
 testdata/Builtins.lc 122:34-122:71  Type
 testdata/Builtins.lc 122:42-122:58  Type->Type
 testdata/Builtins.lc 122:42-122:60  Type
-testdata/Builtins.lc 122:59-122:60  V1
+testdata/Builtins.lc 122:59-122:60  b_
 testdata/Builtins.lc 122:65-122:66  Type
 testdata/Builtins.lc 122:65-122:71  Type
 testdata/Builtins.lc 122:70-122:71  Type
@@ -998,16 +998,16 @@ testdata/Builtins.lc 124:20-124:28  {a} -> {b} -> {c:Nat} -> {_ : Integral a} ->
 testdata/Builtins.lc 124:34-124:80  Type
 testdata/Builtins.lc 124:35-124:43  Type->Type
 testdata/Builtins.lc 124:35-124:45  Type
-testdata/Builtins.lc 124:44-124:45  V5
-testdata/Builtins.lc 124:47-124:48  V5
-testdata/Builtins.lc 124:47-124:50  V4->Type
+testdata/Builtins.lc 124:44-124:45  f_
+testdata/Builtins.lc 124:47-124:48  f_
+testdata/Builtins.lc 124:47-124:50  e_->Type
 testdata/Builtins.lc 124:47-124:64  Type
 testdata/Builtins.lc 124:47-124:80  Type
 testdata/Builtins.lc 124:49-124:50  {a} -> a -> a->Type
 testdata/Builtins.lc 124:51-124:60  Nat -> Type->Type
 testdata/Builtins.lc 124:51-124:62  Type->Type
 testdata/Builtins.lc 124:51-124:64  Type
-testdata/Builtins.lc 124:61-124:62  V2
+testdata/Builtins.lc 124:61-124:62  c_
 testdata/Builtins.lc 124:63-124:64  Type
 testdata/Builtins.lc 124:69-124:70  Type
 testdata/Builtins.lc 124:69-124:80  Type
@@ -1020,16 +1020,16 @@ testdata/Builtins.lc 125:22-125:31  {a} -> {b} -> {c:Nat} -> {_ : Integral a} ->
 testdata/Builtins.lc 125:34-125:80  Type
 testdata/Builtins.lc 125:35-125:43  Type->Type
 testdata/Builtins.lc 125:35-125:45  Type
-testdata/Builtins.lc 125:44-125:45  V5
-testdata/Builtins.lc 125:47-125:48  V5
-testdata/Builtins.lc 125:47-125:50  V4->Type
+testdata/Builtins.lc 125:44-125:45  f_
+testdata/Builtins.lc 125:47-125:48  f_
+testdata/Builtins.lc 125:47-125:50  e_->Type
 testdata/Builtins.lc 125:47-125:64  Type
 testdata/Builtins.lc 125:47-125:80  Type
 testdata/Builtins.lc 125:49-125:50  {a} -> a -> a->Type
 testdata/Builtins.lc 125:51-125:60  Nat -> Type->Type
 testdata/Builtins.lc 125:51-125:62  Type->Type
 testdata/Builtins.lc 125:51-125:64  Type
-testdata/Builtins.lc 125:61-125:62  V2
+testdata/Builtins.lc 125:61-125:62  c_
 testdata/Builtins.lc 125:63-125:64  Type
 testdata/Builtins.lc 125:69-125:70  Type
 testdata/Builtins.lc 125:69-125:80  Type
@@ -1040,16 +1040,16 @@ testdata/Builtins.lc 126:1-126:9  {a} -> {b} -> {c:Nat} -> {_ : Integral a} -> {
 testdata/Builtins.lc 126:34-126:75  Type
 testdata/Builtins.lc 126:35-126:43  Type->Type
 testdata/Builtins.lc 126:35-126:45  Type
-testdata/Builtins.lc 126:44-126:45  V5
-testdata/Builtins.lc 126:47-126:48  V5
-testdata/Builtins.lc 126:47-126:50  V4->Type
+testdata/Builtins.lc 126:44-126:45  f_
+testdata/Builtins.lc 126:47-126:48  f_
+testdata/Builtins.lc 126:47-126:50  e_->Type
 testdata/Builtins.lc 126:47-126:64  Type
 testdata/Builtins.lc 126:47-126:75  Type
 testdata/Builtins.lc 126:49-126:50  {a} -> a -> a->Type
 testdata/Builtins.lc 126:51-126:60  Nat -> Type->Type
 testdata/Builtins.lc 126:51-126:62  Type->Type
 testdata/Builtins.lc 126:51-126:64  Type
-testdata/Builtins.lc 126:61-126:62  V2
+testdata/Builtins.lc 126:61-126:62  c_
 testdata/Builtins.lc 126:63-126:64  Type
 testdata/Builtins.lc 126:69-126:70  Type
 testdata/Builtins.lc 126:69-126:75  Type
@@ -1059,19 +1059,19 @@ testdata/Builtins.lc 127:14-127:25  {a} -> {b} -> {c:Nat} -> {d} -> {_ : Integra
 testdata/Builtins.lc 127:34-127:102  Type
 testdata/Builtins.lc 127:35-127:43  Type->Type
 testdata/Builtins.lc 127:35-127:45  Type
-testdata/Builtins.lc 127:44-127:45  V7
-testdata/Builtins.lc 127:47-127:48  V7
-testdata/Builtins.lc 127:47-127:50  V6->Type
+testdata/Builtins.lc 127:44-127:45  h_
+testdata/Builtins.lc 127:47-127:48  h_
+testdata/Builtins.lc 127:47-127:50  g_->Type
 testdata/Builtins.lc 127:47-127:64  Type
 testdata/Builtins.lc 127:47-127:102  Type
 testdata/Builtins.lc 127:49-127:50  {a} -> a -> a->Type
 testdata/Builtins.lc 127:51-127:60  Nat -> Type->Type
 testdata/Builtins.lc 127:51-127:62  Type->Type
 testdata/Builtins.lc 127:51-127:64  Type
-testdata/Builtins.lc 127:61-127:62  V4
+testdata/Builtins.lc 127:61-127:62  e_
 testdata/Builtins.lc 127:63-127:64  Type
-testdata/Builtins.lc 127:66-127:67  V4
-testdata/Builtins.lc 127:66-127:69  V3->Type
+testdata/Builtins.lc 127:66-127:67  e_
+testdata/Builtins.lc 127:66-127:69  d_->Type
 testdata/Builtins.lc 127:66-127:86  Type
 testdata/Builtins.lc 127:66-127:102  Type
 testdata/Builtins.lc 127:68-127:69  {a} -> a -> a->Type
@@ -1090,16 +1090,16 @@ testdata/Builtins.lc 128:15-128:27  {a} -> {b} -> {c:Nat} -> {_ : Integral a} ->
 testdata/Builtins.lc 128:34-128:83  Type
 testdata/Builtins.lc 128:35-128:43  Type->Type
 testdata/Builtins.lc 128:35-128:45  Type
-testdata/Builtins.lc 128:44-128:45  V5
-testdata/Builtins.lc 128:47-128:48  V5
-testdata/Builtins.lc 128:47-128:50  V4->Type
+testdata/Builtins.lc 128:44-128:45  f_
+testdata/Builtins.lc 128:47-128:48  f_
+testdata/Builtins.lc 128:47-128:50  e_->Type
 testdata/Builtins.lc 128:47-128:64  Type
 testdata/Builtins.lc 128:47-128:83  Type
 testdata/Builtins.lc 128:49-128:50  {a} -> a -> a->Type
 testdata/Builtins.lc 128:51-128:60  Nat -> Type->Type
 testdata/Builtins.lc 128:51-128:62  Type->Type
 testdata/Builtins.lc 128:51-128:64  Type
-testdata/Builtins.lc 128:61-128:62  V2
+testdata/Builtins.lc 128:61-128:62  c_
 testdata/Builtins.lc 128:63-128:64  Type
 testdata/Builtins.lc 128:69-128:70  Type
 testdata/Builtins.lc 128:69-128:83  Type
@@ -1115,14 +1115,14 @@ testdata/Builtins.lc 130:42-130:54  Type
 testdata/Builtins.lc 130:50-130:54  Type
 testdata/Builtins.lc 131:1-131:8  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Bool} -> a->a
 testdata/Builtins.lc 131:47-131:79  Type
-testdata/Builtins.lc 131:48-131:49  V4
-testdata/Builtins.lc 131:48-131:51  V3->Type
+testdata/Builtins.lc 131:48-131:49  e_
+testdata/Builtins.lc 131:48-131:51  d_->Type
 testdata/Builtins.lc 131:48-131:68  Type
 testdata/Builtins.lc 131:50-131:51  {a} -> a -> a->Type
 testdata/Builtins.lc 131:52-131:61  Nat -> Type->Type
 testdata/Builtins.lc 131:52-131:63  Type->Type
 testdata/Builtins.lc 131:52-131:68  Type
-testdata/Builtins.lc 131:62-131:63  V1
+testdata/Builtins.lc 131:62-131:63  b_
 testdata/Builtins.lc 131:64-131:68  Type
 testdata/Builtins.lc 131:73-131:74  Type
 testdata/Builtins.lc 131:73-131:79  Type
@@ -1133,7 +1133,7 @@ testdata/Builtins.lc 132:34-132:43  Nat -> Type->Type
 testdata/Builtins.lc 132:34-132:45  Type->Type
 testdata/Builtins.lc 132:34-132:50  Type
 testdata/Builtins.lc 132:34-132:58  Type
-testdata/Builtins.lc 132:44-132:45  V1
+testdata/Builtins.lc 132:44-132:45  b_
 testdata/Builtins.lc 132:46-132:50  Type
 testdata/Builtins.lc 132:54-132:58  Type
 testdata/Builtins.lc 135:1-135:9  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
@@ -1157,14 +1157,14 @@ testdata/Builtins.lc 135:175-135:183  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Flo
 testdata/Builtins.lc 135:185-135:193  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
 testdata/Builtins.lc 135:195-135:206  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
 testdata/Builtins.lc 136:34-136:67  Type
-testdata/Builtins.lc 136:35-136:36  V4
-testdata/Builtins.lc 136:35-136:38  V3->Type
+testdata/Builtins.lc 136:35-136:36  e_
+testdata/Builtins.lc 136:35-136:38  d_->Type
 testdata/Builtins.lc 136:35-136:56  Type
 testdata/Builtins.lc 136:37-136:38  {a} -> a -> a->Type
 testdata/Builtins.lc 136:39-136:48  Nat -> Type->Type
 testdata/Builtins.lc 136:39-136:50  Type->Type
 testdata/Builtins.lc 136:39-136:56  Type
-testdata/Builtins.lc 136:49-136:50  V1
+testdata/Builtins.lc 136:49-136:50  b_
 testdata/Builtins.lc 136:51-136:56  Type
 testdata/Builtins.lc 136:61-136:62  Type
 testdata/Builtins.lc 136:61-136:67  Type
@@ -1172,14 +1172,14 @@ testdata/Builtins.lc 136:66-136:67  Type
 testdata/Builtins.lc 137:1-137:8  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a -> a->a
 testdata/Builtins.lc 137:10-137:19  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a -> a->a
 testdata/Builtins.lc 137:34-137:72  Type
-testdata/Builtins.lc 137:35-137:36  V4
-testdata/Builtins.lc 137:35-137:38  V3->Type
+testdata/Builtins.lc 137:35-137:36  e_
+testdata/Builtins.lc 137:35-137:38  d_->Type
 testdata/Builtins.lc 137:35-137:56  Type
 testdata/Builtins.lc 137:37-137:38  {a} -> a -> a->Type
 testdata/Builtins.lc 137:39-137:48  Nat -> Type->Type
 testdata/Builtins.lc 137:39-137:50  Type->Type
 testdata/Builtins.lc 137:39-137:56  Type
-testdata/Builtins.lc 137:49-137:50  V1
+testdata/Builtins.lc 137:49-137:50  b_
 testdata/Builtins.lc 137:51-137:56  Type
 testdata/Builtins.lc 137:61-137:62  Type
 testdata/Builtins.lc 137:61-137:72  Type
@@ -1193,14 +1193,14 @@ testdata/Builtins.lc 139:34-139:47  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float
 testdata/Builtins.lc 139:49-139:57  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
 testdata/Builtins.lc 139:59-139:68  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
 testdata/Builtins.lc 140:34-140:67  Type
-testdata/Builtins.lc 140:35-140:36  V4
-testdata/Builtins.lc 140:35-140:38  V3->Type
+testdata/Builtins.lc 140:35-140:36  e_
+testdata/Builtins.lc 140:35-140:38  d_->Type
 testdata/Builtins.lc 140:35-140:56  Type
 testdata/Builtins.lc 140:37-140:38  {a} -> a -> a->Type
 testdata/Builtins.lc 140:39-140:48  Nat -> Type->Type
 testdata/Builtins.lc 140:39-140:50  Type->Type
 testdata/Builtins.lc 140:39-140:56  Type
-testdata/Builtins.lc 140:49-140:50  V1
+testdata/Builtins.lc 140:49-140:50  b_
 testdata/Builtins.lc 140:51-140:56  Type
 testdata/Builtins.lc 140:61-140:62  Type
 testdata/Builtins.lc 140:61-140:67  Type
@@ -1210,16 +1210,16 @@ testdata/Builtins.lc 141:10-141:17  {a} -> {b} -> {c:Nat} -> {_ : Num a} -> {_ :
 testdata/Builtins.lc 141:34-141:75  Type
 testdata/Builtins.lc 141:35-141:38  Type->Type
 testdata/Builtins.lc 141:35-141:40  Type
-testdata/Builtins.lc 141:39-141:40  V5
-testdata/Builtins.lc 141:42-141:43  V5
-testdata/Builtins.lc 141:42-141:45  V4->Type
+testdata/Builtins.lc 141:39-141:40  f_
+testdata/Builtins.lc 141:42-141:43  f_
+testdata/Builtins.lc 141:42-141:45  e_->Type
 testdata/Builtins.lc 141:42-141:59  Type
 testdata/Builtins.lc 141:42-141:75  Type
 testdata/Builtins.lc 141:44-141:45  {a} -> a -> a->Type
 testdata/Builtins.lc 141:46-141:55  Nat -> Type->Type
 testdata/Builtins.lc 141:46-141:57  Type->Type
 testdata/Builtins.lc 141:46-141:59  Type
-testdata/Builtins.lc 141:56-141:57  V2
+testdata/Builtins.lc 141:56-141:57  c_
 testdata/Builtins.lc 141:58-141:59  Type
 testdata/Builtins.lc 141:64-141:65  Type
 testdata/Builtins.lc 141:64-141:75  Type
@@ -1231,16 +1231,16 @@ testdata/Builtins.lc 142:11-142:19  {a} -> {b} -> {c:Nat} -> {_ : Num a} -> {_ :
 testdata/Builtins.lc 142:34-142:75  Type
 testdata/Builtins.lc 142:35-142:38  Type->Type
 testdata/Builtins.lc 142:35-142:40  Type
-testdata/Builtins.lc 142:39-142:40  V5
-testdata/Builtins.lc 142:42-142:43  V5
-testdata/Builtins.lc 142:42-142:45  V4->Type
+testdata/Builtins.lc 142:39-142:40  f_
+testdata/Builtins.lc 142:42-142:43  f_
+testdata/Builtins.lc 142:42-142:45  e_->Type
 testdata/Builtins.lc 142:42-142:59  Type
 testdata/Builtins.lc 142:42-142:75  Type
 testdata/Builtins.lc 142:44-142:45  {a} -> a -> a->Type
 testdata/Builtins.lc 142:46-142:55  Nat -> Type->Type
 testdata/Builtins.lc 142:46-142:57  Type->Type
 testdata/Builtins.lc 142:46-142:59  Type
-testdata/Builtins.lc 142:56-142:57  V2
+testdata/Builtins.lc 142:56-142:57  c_
 testdata/Builtins.lc 142:58-142:59  Type
 testdata/Builtins.lc 142:64-142:65  Type
 testdata/Builtins.lc 142:64-142:75  Type
@@ -1250,17 +1250,17 @@ testdata/Builtins.lc 142:74-142:75  Type
 testdata/Builtins.lc 143:1-143:10  {a} -> {b:Nat} -> {c} -> {_ : a ~ VecScalar b Float} -> {_ : c ~ VecScalar b Bool} -> a->c
 testdata/Builtins.lc 143:12-143:21  {a} -> {b:Nat} -> {c} -> {_ : a ~ VecScalar b Float} -> {_ : c ~ VecScalar b Bool} -> a->c
 testdata/Builtins.lc 143:34-143:89  Type
-testdata/Builtins.lc 143:35-143:36  V6
-testdata/Builtins.lc 143:35-143:38  V5->Type
+testdata/Builtins.lc 143:35-143:36  g_
+testdata/Builtins.lc 143:35-143:38  f_->Type
 testdata/Builtins.lc 143:35-143:56  Type
 testdata/Builtins.lc 143:37-143:38  {a} -> a -> a->Type
 testdata/Builtins.lc 143:39-143:48  Nat -> Type->Type
 testdata/Builtins.lc 143:39-143:50  Type->Type
 testdata/Builtins.lc 143:39-143:56  Type
-testdata/Builtins.lc 143:49-143:50  V3
+testdata/Builtins.lc 143:49-143:50  d_
 testdata/Builtins.lc 143:51-143:56  Type
-testdata/Builtins.lc 143:58-143:59  V3
-testdata/Builtins.lc 143:58-143:61  V2->Type
+testdata/Builtins.lc 143:58-143:59  d_
+testdata/Builtins.lc 143:58-143:61  c_->Type
 testdata/Builtins.lc 143:58-143:78  Type
 testdata/Builtins.lc 143:58-143:89  Type
 testdata/Builtins.lc 143:60-143:61  {a} -> a -> a->Type
@@ -1277,30 +1277,30 @@ testdata/Builtins.lc 144:10-144:18  {a} -> {b} -> {c:Nat} -> {_ : Signed a} -> {
 testdata/Builtins.lc 144:34-144:73  Type
 testdata/Builtins.lc 144:35-144:41  Type->Type
 testdata/Builtins.lc 144:35-144:43  Type
-testdata/Builtins.lc 144:42-144:43  V5
-testdata/Builtins.lc 144:45-144:46  V5
-testdata/Builtins.lc 144:45-144:48  V4->Type
+testdata/Builtins.lc 144:42-144:43  f_
+testdata/Builtins.lc 144:45-144:46  f_
+testdata/Builtins.lc 144:45-144:48  e_->Type
 testdata/Builtins.lc 144:45-144:62  Type
 testdata/Builtins.lc 144:45-144:73  Type
 testdata/Builtins.lc 144:47-144:48  {a} -> a -> a->Type
 testdata/Builtins.lc 144:49-144:58  Nat -> Type->Type
 testdata/Builtins.lc 144:49-144:60  Type->Type
 testdata/Builtins.lc 144:49-144:62  Type
-testdata/Builtins.lc 144:59-144:60  V2
+testdata/Builtins.lc 144:59-144:60  c_
 testdata/Builtins.lc 144:61-144:62  Type
 testdata/Builtins.lc 144:67-144:68  Type
 testdata/Builtins.lc 144:67-144:73  Type
 testdata/Builtins.lc 144:72-144:73  Type
 testdata/Builtins.lc 145:1-145:9  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->(a, a)
 testdata/Builtins.lc 145:34-145:72  Type
-testdata/Builtins.lc 145:35-145:36  V4
-testdata/Builtins.lc 145:35-145:38  V3->Type
+testdata/Builtins.lc 145:35-145:36  e_
+testdata/Builtins.lc 145:35-145:38  d_->Type
 testdata/Builtins.lc 145:35-145:56  Type
 testdata/Builtins.lc 145:37-145:38  {a} -> a -> a->Type
 testdata/Builtins.lc 145:39-145:48  Nat -> Type->Type
 testdata/Builtins.lc 145:39-145:50  Type->Type
 testdata/Builtins.lc 145:39-145:56  Type
-testdata/Builtins.lc 145:49-145:50  V1
+testdata/Builtins.lc 145:49-145:50  b_
 testdata/Builtins.lc 145:51-145:56  Type
 testdata/Builtins.lc 145:61-145:62  Type
 testdata/Builtins.lc 145:61-145:72  Type
@@ -1312,16 +1312,16 @@ testdata/Builtins.lc 146:1-146:10  {a} -> {b} -> {c:Nat} -> {_ : Num a} -> {_ :
 testdata/Builtins.lc 146:34-146:80  Type
 testdata/Builtins.lc 146:35-146:38  Type->Type
 testdata/Builtins.lc 146:35-146:40  Type
-testdata/Builtins.lc 146:39-146:40  V5
-testdata/Builtins.lc 146:42-146:43  V5
-testdata/Builtins.lc 146:42-146:45  V4->Type
+testdata/Builtins.lc 146:39-146:40  f_
+testdata/Builtins.lc 146:42-146:43  f_
+testdata/Builtins.lc 146:42-146:45  e_->Type
 testdata/Builtins.lc 146:42-146:59  Type
 testdata/Builtins.lc 146:42-146:80  Type
 testdata/Builtins.lc 146:44-146:45  {a} -> a -> a->Type
 testdata/Builtins.lc 146:46-146:55  Nat -> Type->Type
 testdata/Builtins.lc 146:46-146:57  Type->Type
 testdata/Builtins.lc 146:46-146:59  Type
-testdata/Builtins.lc 146:56-146:57  V2
+testdata/Builtins.lc 146:56-146:57  c_
 testdata/Builtins.lc 146:58-146:59  Type
 testdata/Builtins.lc 146:64-146:65  Type
 testdata/Builtins.lc 146:64-146:80  Type
@@ -1334,16 +1334,16 @@ testdata/Builtins.lc 147:1-147:11  {a} -> {b} -> {c:Nat} -> {_ : Num a} -> {_ :
 testdata/Builtins.lc 147:34-147:80  Type
 testdata/Builtins.lc 147:35-147:38  Type->Type
 testdata/Builtins.lc 147:35-147:40  Type
-testdata/Builtins.lc 147:39-147:40  V5
-testdata/Builtins.lc 147:42-147:43  V5
-testdata/Builtins.lc 147:42-147:45  V4->Type
+testdata/Builtins.lc 147:39-147:40  f_
+testdata/Builtins.lc 147:42-147:43  f_
+testdata/Builtins.lc 147:42-147:45  e_->Type
 testdata/Builtins.lc 147:42-147:59  Type
 testdata/Builtins.lc 147:42-147:80  Type
 testdata/Builtins.lc 147:44-147:45  {a} -> a -> a->Type
 testdata/Builtins.lc 147:46-147:55  Nat -> Type->Type
 testdata/Builtins.lc 147:46-147:57  Type->Type
 testdata/Builtins.lc 147:46-147:59  Type
-testdata/Builtins.lc 147:56-147:57  V2
+testdata/Builtins.lc 147:56-147:57  c_
 testdata/Builtins.lc 147:58-147:59  Type
 testdata/Builtins.lc 147:64-147:65  Type
 testdata/Builtins.lc 147:64-147:80  Type
@@ -1354,14 +1354,14 @@ testdata/Builtins.lc 147:74-147:80  Type
 testdata/Builtins.lc 147:79-147:80  Type
 testdata/Builtins.lc 148:1-148:8  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a -> a -> a->a
 testdata/Builtins.lc 148:34-148:77  Type
-testdata/Builtins.lc 148:35-148:36  V4
-testdata/Builtins.lc 148:35-148:38  V3->Type
+testdata/Builtins.lc 148:35-148:36  e_
+testdata/Builtins.lc 148:35-148:38  d_->Type
 testdata/Builtins.lc 148:35-148:56  Type
 testdata/Builtins.lc 148:37-148:38  {a} -> a -> a->Type
 testdata/Builtins.lc 148:39-148:48  Nat -> Type->Type
 testdata/Builtins.lc 148:39-148:50  Type->Type
 testdata/Builtins.lc 148:39-148:56  Type
-testdata/Builtins.lc 148:49-148:50  V1
+testdata/Builtins.lc 148:49-148:50  b_
 testdata/Builtins.lc 148:51-148:56  Type
 testdata/Builtins.lc 148:61-148:62  Type
 testdata/Builtins.lc 148:61-148:77  Type
@@ -1372,14 +1372,14 @@ testdata/Builtins.lc 148:71-148:77  Type
 testdata/Builtins.lc 148:76-148:77  Type
 testdata/Builtins.lc 149:1-149:9  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a -> a -> Float->a
 testdata/Builtins.lc 149:34-149:81  Type
-testdata/Builtins.lc 149:35-149:36  V4
-testdata/Builtins.lc 149:35-149:38  V3->Type
+testdata/Builtins.lc 149:35-149:36  e_
+testdata/Builtins.lc 149:35-149:38  d_->Type
 testdata/Builtins.lc 149:35-149:56  Type
 testdata/Builtins.lc 149:37-149:38  {a} -> a -> a->Type
 testdata/Builtins.lc 149:39-149:48  Nat -> Type->Type
 testdata/Builtins.lc 149:39-149:50  Type->Type
 testdata/Builtins.lc 149:39-149:56  Type
-testdata/Builtins.lc 149:49-149:50  V1
+testdata/Builtins.lc 149:49-149:50  b_
 testdata/Builtins.lc 149:51-149:56  Type
 testdata/Builtins.lc 149:61-149:62  Type
 testdata/Builtins.lc 149:61-149:81  Type
@@ -1390,17 +1390,17 @@ testdata/Builtins.lc 149:71-149:81  Type
 testdata/Builtins.lc 149:80-149:81  Type
 testdata/Builtins.lc 150:1-150:9  {a} -> {b:Nat} -> {c} -> {_ : a ~ VecScalar b Float} -> {_ : c ~ VecScalar b Bool} -> a -> a -> c->a
 testdata/Builtins.lc 150:34-150:99  Type
-testdata/Builtins.lc 150:35-150:36  V6
-testdata/Builtins.lc 150:35-150:38  V5->Type
+testdata/Builtins.lc 150:35-150:36  g_
+testdata/Builtins.lc 150:35-150:38  f_->Type
 testdata/Builtins.lc 150:35-150:56  Type
 testdata/Builtins.lc 150:37-150:38  {a} -> a -> a->Type
 testdata/Builtins.lc 150:39-150:48  Nat -> Type->Type
 testdata/Builtins.lc 150:39-150:50  Type->Type
 testdata/Builtins.lc 150:39-150:56  Type
-testdata/Builtins.lc 150:49-150:50  V3
+testdata/Builtins.lc 150:49-150:50  d_
 testdata/Builtins.lc 150:51-150:56  Type
-testdata/Builtins.lc 150:58-150:59  V3
-testdata/Builtins.lc 150:58-150:61  V2->Type
+testdata/Builtins.lc 150:58-150:59  d_
+testdata/Builtins.lc 150:58-150:61  c_->Type
 testdata/Builtins.lc 150:58-150:78  Type
 testdata/Builtins.lc 150:58-150:99  Type
 testdata/Builtins.lc 150:60-150:61  {a} -> a -> a->Type
@@ -1418,14 +1418,14 @@ testdata/Builtins.lc 150:93-150:99  Type
 testdata/Builtins.lc 150:98-150:99  Type
 testdata/Builtins.lc 151:1-151:9  {a} -> {b:Nat} -> {_ : a ~ VecS Float b} -> a -> a->a
 testdata/Builtins.lc 151:34-151:66  Type
-testdata/Builtins.lc 151:35-151:36  V4
-testdata/Builtins.lc 151:35-151:38  V3->Type
+testdata/Builtins.lc 151:35-151:36  e_
+testdata/Builtins.lc 151:35-151:38  d_->Type
 testdata/Builtins.lc 151:35-151:50  Type
 testdata/Builtins.lc 151:37-151:38  {a} -> a -> a->Type
 testdata/Builtins.lc 151:39-151:42  Nat -> Type->Type
 testdata/Builtins.lc 151:39-151:44  Type->Type
 testdata/Builtins.lc 151:39-151:50  Type
-testdata/Builtins.lc 151:43-151:44  V1
+testdata/Builtins.lc 151:43-151:44  b_
 testdata/Builtins.lc 151:45-151:50  Type
 testdata/Builtins.lc 151:55-151:56  Type
 testdata/Builtins.lc 151:55-151:66  Type
@@ -1434,14 +1434,14 @@ testdata/Builtins.lc 151:60-151:66  Type
 testdata/Builtins.lc 151:65-151:66  Type
 testdata/Builtins.lc 152:1-152:10  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> Float -> a->a
 testdata/Builtins.lc 152:34-152:76  Type
-testdata/Builtins.lc 152:35-152:36  V4
-testdata/Builtins.lc 152:35-152:38  V3->Type
+testdata/Builtins.lc 152:35-152:36  e_
+testdata/Builtins.lc 152:35-152:38  d_->Type
 testdata/Builtins.lc 152:35-152:56  Type
 testdata/Builtins.lc 152:37-152:38  {a} -> a -> a->Type
 testdata/Builtins.lc 152:39-152:48  Nat -> Type->Type
 testdata/Builtins.lc 152:39-152:50  Type->Type
 testdata/Builtins.lc 152:39-152:56  Type
-testdata/Builtins.lc 152:49-152:50  V1
+testdata/Builtins.lc 152:49-152:50  b_
 testdata/Builtins.lc 152:51-152:56  Type
 testdata/Builtins.lc 152:61-152:66  Type
 testdata/Builtins.lc 152:61-152:76  Type
@@ -1450,14 +1450,14 @@ testdata/Builtins.lc 152:70-152:76  Type
 testdata/Builtins.lc 152:75-152:76  Type
 testdata/Builtins.lc 153:1-153:15  {a} -> {b:Nat} -> {_ : a ~ VecS Float b} -> a -> a -> a->a
 testdata/Builtins.lc 153:34-153:71  Type
-testdata/Builtins.lc 153:35-153:36  V4
-testdata/Builtins.lc 153:35-153:38  V3->Type
+testdata/Builtins.lc 153:35-153:36  e_
+testdata/Builtins.lc 153:35-153:38  d_->Type
 testdata/Builtins.lc 153:35-153:50  Type
 testdata/Builtins.lc 153:37-153:38  {a} -> a -> a->Type
 testdata/Builtins.lc 153:39-153:42  Nat -> Type->Type
 testdata/Builtins.lc 153:39-153:44  Type->Type
 testdata/Builtins.lc 153:39-153:50  Type
-testdata/Builtins.lc 153:43-153:44  V1
+testdata/Builtins.lc 153:43-153:44  b_
 testdata/Builtins.lc 153:45-153:50  Type
 testdata/Builtins.lc 153:55-153:56  Type
 testdata/Builtins.lc 153:55-153:71  Type
@@ -1468,14 +1468,14 @@ testdata/Builtins.lc 153:65-153:71  Type
 testdata/Builtins.lc 153:70-153:71  Type
 testdata/Builtins.lc 154:1-154:16  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> Float -> Float -> a->a
 testdata/Builtins.lc 154:34-154:85  Type
-testdata/Builtins.lc 154:35-154:36  V4
-testdata/Builtins.lc 154:35-154:38  V3->Type
+testdata/Builtins.lc 154:35-154:36  e_
+testdata/Builtins.lc 154:35-154:38  d_->Type
 testdata/Builtins.lc 154:35-154:56  Type
 testdata/Builtins.lc 154:37-154:38  {a} -> a -> a->Type
 testdata/Builtins.lc 154:39-154:48  Nat -> Type->Type
 testdata/Builtins.lc 154:39-154:50  Type->Type
 testdata/Builtins.lc 154:39-154:56  Type
-testdata/Builtins.lc 154:49-154:50  V1
+testdata/Builtins.lc 154:49-154:50  b_
 testdata/Builtins.lc 154:51-154:56  Type
 testdata/Builtins.lc 154:61-154:66  Type
 testdata/Builtins.lc 154:61-154:85  Type
@@ -1489,7 +1489,7 @@ testdata/Builtins.lc 157:34-157:43  Nat -> Type->Type
 testdata/Builtins.lc 157:34-157:45  Type->Type
 testdata/Builtins.lc 157:34-157:51  Type
 testdata/Builtins.lc 157:34-157:70  Type
-testdata/Builtins.lc 157:44-157:45  V1
+testdata/Builtins.lc 157:44-157:45  b_
 testdata/Builtins.lc 157:46-157:51  Type
 testdata/Builtins.lc 157:55-157:64  Nat -> Type->Type
 testdata/Builtins.lc 157:55-157:66  Type->Type
@@ -1501,7 +1501,7 @@ testdata/Builtins.lc 158:34-158:43  Nat -> Type->Type
 testdata/Builtins.lc 158:34-158:45  Type->Type
 testdata/Builtins.lc 158:34-158:51  Type
 testdata/Builtins.lc 158:34-158:71  Type
-testdata/Builtins.lc 158:44-158:45  V1
+testdata/Builtins.lc 158:44-158:45  b_
 testdata/Builtins.lc 158:46-158:51  Type
 testdata/Builtins.lc 158:55-158:64  Nat -> Type->Type
 testdata/Builtins.lc 158:55-158:66  Type->Type
@@ -1513,7 +1513,7 @@ testdata/Builtins.lc 159:34-159:43  Nat -> Type->Type
 testdata/Builtins.lc 159:34-159:45  Type->Type
 testdata/Builtins.lc 159:34-159:49  Type
 testdata/Builtins.lc 159:34-159:72  Type
-testdata/Builtins.lc 159:44-159:45  V1
+testdata/Builtins.lc 159:44-159:45  b_
 testdata/Builtins.lc 159:46-159:49  Type
 testdata/Builtins.lc 159:55-159:64  Nat -> Type->Type
 testdata/Builtins.lc 159:55-159:66  Type->Type
@@ -1525,7 +1525,7 @@ testdata/Builtins.lc 160:34-160:43  Nat -> Type->Type
 testdata/Builtins.lc 160:34-160:45  Type->Type
 testdata/Builtins.lc 160:34-160:50  Type
 testdata/Builtins.lc 160:34-160:72  Type
-testdata/Builtins.lc 160:44-160:45  V1
+testdata/Builtins.lc 160:44-160:45  b_
 testdata/Builtins.lc 160:46-160:50  Type
 testdata/Builtins.lc 160:55-160:64  Nat -> Type->Type
 testdata/Builtins.lc 160:55-160:66  Type->Type
@@ -1534,14 +1534,14 @@ testdata/Builtins.lc 160:65-160:66  Nat
 testdata/Builtins.lc 160:67-160:72  Type
 testdata/Builtins.lc 162:1-162:11  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->Float
 testdata/Builtins.lc 162:34-162:71  Type
-testdata/Builtins.lc 162:35-162:36  V4
-testdata/Builtins.lc 162:35-162:38  V3->Type
+testdata/Builtins.lc 162:35-162:36  e_
+testdata/Builtins.lc 162:35-162:38  d_->Type
 testdata/Builtins.lc 162:35-162:56  Type
 testdata/Builtins.lc 162:37-162:38  {a} -> a -> a->Type
 testdata/Builtins.lc 162:39-162:48  Nat -> Type->Type
 testdata/Builtins.lc 162:39-162:50  Type->Type
 testdata/Builtins.lc 162:39-162:56  Type
-testdata/Builtins.lc 162:49-162:50  V1
+testdata/Builtins.lc 162:49-162:50  b_
 testdata/Builtins.lc 162:51-162:56  Type
 testdata/Builtins.lc 162:61-162:62  Type
 testdata/Builtins.lc 162:61-162:71  Type
@@ -1549,14 +1549,14 @@ testdata/Builtins.lc 162:66-162:71  Type
 testdata/Builtins.lc 163:1-163:13  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a -> a->Float
 testdata/Builtins.lc 163:15-163:22  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a -> a->Float
 testdata/Builtins.lc 163:34-163:76  Type
-testdata/Builtins.lc 163:35-163:36  V4
-testdata/Builtins.lc 163:35-163:38  V3->Type
+testdata/Builtins.lc 163:35-163:36  e_
+testdata/Builtins.lc 163:35-163:38  d_->Type
 testdata/Builtins.lc 163:35-163:56  Type
 testdata/Builtins.lc 163:37-163:38  {a} -> a -> a->Type
 testdata/Builtins.lc 163:39-163:48  Nat -> Type->Type
 testdata/Builtins.lc 163:39-163:50  Type->Type
 testdata/Builtins.lc 163:39-163:56  Type
-testdata/Builtins.lc 163:49-163:50  V1
+testdata/Builtins.lc 163:49-163:50  b_
 testdata/Builtins.lc 163:51-163:56  Type
 testdata/Builtins.lc 163:61-163:62  Type
 testdata/Builtins.lc 163:61-163:76  Type
@@ -1565,14 +1565,14 @@ testdata/Builtins.lc 163:66-163:76  Type
 testdata/Builtins.lc 163:71-163:76  Type
 testdata/Builtins.lc 164:1-164:10  {a} -> {_ : a ~ VecS Float 3} -> a -> a->a
 testdata/Builtins.lc 164:34-164:72  Type
-testdata/Builtins.lc 164:35-164:36  V2
-testdata/Builtins.lc 164:35-164:38  V1->Type
+testdata/Builtins.lc 164:35-164:36  c_
+testdata/Builtins.lc 164:35-164:38  b_->Type
 testdata/Builtins.lc 164:35-164:56  Type
 testdata/Builtins.lc 164:37-164:38  {a} -> a -> a->Type
 testdata/Builtins.lc 164:39-164:48  Nat -> Type->Type
 testdata/Builtins.lc 164:39-164:50  Type->Type
 testdata/Builtins.lc 164:39-164:56  Type
-testdata/Builtins.lc 164:49-164:50  V1
+testdata/Builtins.lc 164:49-164:50  b_
 testdata/Builtins.lc 164:51-164:56  Type
 testdata/Builtins.lc 164:61-164:62  Type
 testdata/Builtins.lc 164:61-164:72  Type
@@ -1581,14 +1581,14 @@ testdata/Builtins.lc 164:66-164:72  Type
 testdata/Builtins.lc 164:71-164:72  Type
 testdata/Builtins.lc 165:1-165:14  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
 testdata/Builtins.lc 165:34-165:67  Type
-testdata/Builtins.lc 165:35-165:36  V4
-testdata/Builtins.lc 165:35-165:38  V3->Type
+testdata/Builtins.lc 165:35-165:36  e_
+testdata/Builtins.lc 165:35-165:38  d_->Type
 testdata/Builtins.lc 165:35-165:56  Type
 testdata/Builtins.lc 165:37-165:38  {a} -> a -> a->Type
 testdata/Builtins.lc 165:39-165:48  Nat -> Type->Type
 testdata/Builtins.lc 165:39-165:50  Type->Type
 testdata/Builtins.lc 165:39-165:56  Type
-testdata/Builtins.lc 165:49-165:50  V1
+testdata/Builtins.lc 165:49-165:50  b_
 testdata/Builtins.lc 165:51-165:56  Type
 testdata/Builtins.lc 165:61-165:62  Type
 testdata/Builtins.lc 165:61-165:67  Type
@@ -1596,14 +1596,14 @@ testdata/Builtins.lc 165:66-165:67  Type
 testdata/Builtins.lc 166:1-166:16  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a -> a -> a->a
 testdata/Builtins.lc 166:18-166:29  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a -> a -> a->a
 testdata/Builtins.lc 166:34-166:77  Type
-testdata/Builtins.lc 166:35-166:36  V4
-testdata/Builtins.lc 166:35-166:38  V3->Type
+testdata/Builtins.lc 166:35-166:36  e_
+testdata/Builtins.lc 166:35-166:38  d_->Type
 testdata/Builtins.lc 166:35-166:56  Type
 testdata/Builtins.lc 166:37-166:38  {a} -> a -> a->Type
 testdata/Builtins.lc 166:39-166:48  Nat -> Type->Type
 testdata/Builtins.lc 166:39-166:50  Type->Type
 testdata/Builtins.lc 166:39-166:56  Type
-testdata/Builtins.lc 166:49-166:50  V1
+testdata/Builtins.lc 166:49-166:50  b_
 testdata/Builtins.lc 166:51-166:56  Type
 testdata/Builtins.lc 166:61-166:62  Type
 testdata/Builtins.lc 166:61-166:77  Type
@@ -1614,14 +1614,14 @@ testdata/Builtins.lc 166:71-166:77  Type
 testdata/Builtins.lc 166:76-166:77  Type
 testdata/Builtins.lc 167:1-167:12  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a -> a->a
 testdata/Builtins.lc 167:34-167:72  Type
-testdata/Builtins.lc 167:35-167:36  V4
-testdata/Builtins.lc 167:35-167:38  V3->Type
+testdata/Builtins.lc 167:35-167:36  e_
+testdata/Builtins.lc 167:35-167:38  d_->Type
 testdata/Builtins.lc 167:35-167:56  Type
 testdata/Builtins.lc 167:37-167:38  {a} -> a -> a->Type
 testdata/Builtins.lc 167:39-167:48  Nat -> Type->Type
 testdata/Builtins.lc 167:39-167:50  Type->Type
 testdata/Builtins.lc 167:39-167:56  Type
-testdata/Builtins.lc 167:49-167:50  V1
+testdata/Builtins.lc 167:49-167:50  b_
 testdata/Builtins.lc 167:51-167:56  Type
 testdata/Builtins.lc 167:61-167:62  Type
 testdata/Builtins.lc 167:61-167:72  Type
@@ -1634,9 +1634,9 @@ testdata/Builtins.lc 169:34-169:39  Nat -> Type->Type
 testdata/Builtins.lc 169:34-169:41  Type->Type
 testdata/Builtins.lc 169:34-169:43  Type
 testdata/Builtins.lc 169:34-169:56  Type
-testdata/Builtins.lc 169:38-169:39  V5
-testdata/Builtins.lc 169:40-169:41  V3
-testdata/Builtins.lc 169:42-169:43  V1
+testdata/Builtins.lc 169:38-169:39  f_
+testdata/Builtins.lc 169:40-169:41  d_
+testdata/Builtins.lc 169:42-169:43  b_
 testdata/Builtins.lc 169:47-169:50  Nat -> Nat -> Type->Type
 testdata/Builtins.lc 169:47-169:52  Nat -> Type->Type
 testdata/Builtins.lc 169:47-169:54  Type->Type
@@ -1650,9 +1650,9 @@ testdata/Builtins.lc 170:34-170:39  Nat -> Type->Type
 testdata/Builtins.lc 170:34-170:41  Type->Type
 testdata/Builtins.lc 170:34-170:43  Type
 testdata/Builtins.lc 170:34-170:52  Type
-testdata/Builtins.lc 170:38-170:39  V3
+testdata/Builtins.lc 170:38-170:39  d_
 testdata/Builtins.lc 170:40-170:41  Nat
-testdata/Builtins.lc 170:42-170:43  V1
+testdata/Builtins.lc 170:42-170:43  b_
 testdata/Builtins.lc 170:47-170:52  Type
 testdata/Builtins.lc 171:1-171:12  {a:Nat} -> {b} -> Mat a a b -> Mat a a b
 testdata/Builtins.lc 171:34-171:37  Nat -> Nat -> Type->Type
@@ -1660,9 +1660,9 @@ testdata/Builtins.lc 171:34-171:39  Nat -> Type->Type
 testdata/Builtins.lc 171:34-171:41  Type->Type
 testdata/Builtins.lc 171:34-171:43  Type
 testdata/Builtins.lc 171:34-171:56  Type
-testdata/Builtins.lc 171:38-171:39  V3
+testdata/Builtins.lc 171:38-171:39  d_
 testdata/Builtins.lc 171:40-171:41  Nat
-testdata/Builtins.lc 171:42-171:43  V1
+testdata/Builtins.lc 171:42-171:43  b_
 testdata/Builtins.lc 171:47-171:50  Nat -> Nat -> Type->Type
 testdata/Builtins.lc 171:47-171:52  Nat -> Type->Type
 testdata/Builtins.lc 171:47-171:54  Type->Type
@@ -1675,13 +1675,13 @@ testdata/Builtins.lc 172:34-172:37  Nat -> Type->Type
 testdata/Builtins.lc 172:34-172:39  Type->Type
 testdata/Builtins.lc 172:34-172:41  Type
 testdata/Builtins.lc 172:34-172:69  Type
-testdata/Builtins.lc 172:38-172:39  V5
-testdata/Builtins.lc 172:40-172:41  V3
+testdata/Builtins.lc 172:38-172:39  f_
+testdata/Builtins.lc 172:40-172:41  d_
 testdata/Builtins.lc 172:47-172:50  Nat -> Type->Type
 testdata/Builtins.lc 172:47-172:52  Type->Type
 testdata/Builtins.lc 172:47-172:54  Type
 testdata/Builtins.lc 172:47-172:69  Type
-testdata/Builtins.lc 172:51-172:52  V2
+testdata/Builtins.lc 172:51-172:52  c_
 testdata/Builtins.lc 172:53-172:54  Type
 testdata/Builtins.lc 172:60-172:63  Nat -> Nat -> Type->Type
 testdata/Builtins.lc 172:60-172:65  Nat -> Type->Type
@@ -1696,9 +1696,9 @@ testdata/Builtins.lc 173:34-173:39  Nat -> Type->Type
 testdata/Builtins.lc 173:34-173:41  Type->Type
 testdata/Builtins.lc 173:34-173:43  Type
 testdata/Builtins.lc 173:34-173:67  Type
-testdata/Builtins.lc 173:38-173:39  V5
-testdata/Builtins.lc 173:40-173:41  V3
-testdata/Builtins.lc 173:42-173:43  V1
+testdata/Builtins.lc 173:38-173:39  f_
+testdata/Builtins.lc 173:40-173:41  d_
+testdata/Builtins.lc 173:42-173:43  b_
 testdata/Builtins.lc 173:47-173:50  Nat -> Type->Type
 testdata/Builtins.lc 173:47-173:52  Type->Type
 testdata/Builtins.lc 173:47-173:54  Type
@@ -1715,15 +1715,15 @@ testdata/Builtins.lc 174:34-174:37  Nat -> Type->Type
 testdata/Builtins.lc 174:34-174:39  Type->Type
 testdata/Builtins.lc 174:34-174:41  Type
 testdata/Builtins.lc 174:34-174:67  Type
-testdata/Builtins.lc 174:38-174:39  V5
-testdata/Builtins.lc 174:40-174:41  V3
+testdata/Builtins.lc 174:38-174:39  f_
+testdata/Builtins.lc 174:40-174:41  d_
 testdata/Builtins.lc 174:47-174:50  Nat -> Nat -> Type->Type
 testdata/Builtins.lc 174:47-174:52  Nat -> Type->Type
 testdata/Builtins.lc 174:47-174:54  Type->Type
 testdata/Builtins.lc 174:47-174:56  Type
 testdata/Builtins.lc 174:47-174:67  Type
 testdata/Builtins.lc 174:51-174:52  Nat
-testdata/Builtins.lc 174:53-174:54  V2
+testdata/Builtins.lc 174:53-174:54  c_
 testdata/Builtins.lc 174:55-174:56  Type
 testdata/Builtins.lc 174:60-174:63  Nat -> Type->Type
 testdata/Builtins.lc 174:60-174:65  Type->Type
@@ -1736,16 +1736,16 @@ testdata/Builtins.lc 175:34-175:39  Nat -> Type->Type
 testdata/Builtins.lc 175:34-175:41  Type->Type
 testdata/Builtins.lc 175:34-175:43  Type
 testdata/Builtins.lc 175:34-175:69  Type
-testdata/Builtins.lc 175:38-175:39  V7
-testdata/Builtins.lc 175:40-175:41  V5
-testdata/Builtins.lc 175:42-175:43  V3
+testdata/Builtins.lc 175:38-175:39  h_
+testdata/Builtins.lc 175:40-175:41  f_
+testdata/Builtins.lc 175:42-175:43  d_
 testdata/Builtins.lc 175:47-175:50  Nat -> Nat -> Type->Type
 testdata/Builtins.lc 175:47-175:52  Nat -> Type->Type
 testdata/Builtins.lc 175:47-175:54  Type->Type
 testdata/Builtins.lc 175:47-175:56  Type
 testdata/Builtins.lc 175:47-175:69  Type
 testdata/Builtins.lc 175:51-175:52  Nat
-testdata/Builtins.lc 175:53-175:54  V2
+testdata/Builtins.lc 175:53-175:54  c_
 testdata/Builtins.lc 175:55-175:56  Type
 testdata/Builtins.lc 175:60-175:63  Nat -> Nat -> Type->Type
 testdata/Builtins.lc 175:60-175:65  Nat -> Type->Type
@@ -1763,19 +1763,19 @@ testdata/Builtins.lc 177:85-177:98  {a} -> {b:Nat} -> {c} -> {d} -> {_ : Num c}
 testdata/Builtins.lc 178:51-178:114  Type
 testdata/Builtins.lc 178:52-178:55  Type->Type
 testdata/Builtins.lc 178:52-178:57  Type
-testdata/Builtins.lc 178:56-178:57  V3
-testdata/Builtins.lc 178:59-178:60  V8
-testdata/Builtins.lc 178:59-178:62  V7->Type
+testdata/Builtins.lc 178:56-178:57  d_
+testdata/Builtins.lc 178:59-178:60  i_
+testdata/Builtins.lc 178:59-178:62  h_->Type
 testdata/Builtins.lc 178:59-178:76  Type
 testdata/Builtins.lc 178:59-178:114  Type
 testdata/Builtins.lc 178:61-178:62  {a} -> a -> a->Type
 testdata/Builtins.lc 178:63-178:72  Nat -> Type->Type
 testdata/Builtins.lc 178:63-178:74  Type->Type
 testdata/Builtins.lc 178:63-178:76  Type
-testdata/Builtins.lc 178:73-178:74  V5
+testdata/Builtins.lc 178:73-178:74  f_
 testdata/Builtins.lc 178:75-178:76  Type
-testdata/Builtins.lc 178:78-178:79  V4
-testdata/Builtins.lc 178:78-178:81  V3->Type
+testdata/Builtins.lc 178:78-178:79  e_
+testdata/Builtins.lc 178:78-178:81  d_->Type
 testdata/Builtins.lc 178:78-178:98  Type
 testdata/Builtins.lc 178:78-178:114  Type
 testdata/Builtins.lc 178:80-178:81  {a} -> a -> a->Type
@@ -1792,13 +1792,13 @@ testdata/Builtins.lc 178:113-178:114  Type
 testdata/Builtins.lc 179:1-179:10  {a} -> {b} -> {_ : b ~ MatVecScalarElem a} -> a -> a->Bool
 testdata/Builtins.lc 179:12-179:24  {a} -> {b} -> {_ : b ~ MatVecScalarElem a} -> a -> a->Bool
 testdata/Builtins.lc 179:47-179:89  Type
-testdata/Builtins.lc 179:48-179:49  V2
-testdata/Builtins.lc 179:48-179:51  V1->Type
+testdata/Builtins.lc 179:48-179:49  c_
+testdata/Builtins.lc 179:48-179:51  b_->Type
 testdata/Builtins.lc 179:48-179:70  Type
 testdata/Builtins.lc 179:50-179:51  {a} -> a -> a->Type
 testdata/Builtins.lc 179:52-179:68  Type->Type
 testdata/Builtins.lc 179:52-179:70  Type
-testdata/Builtins.lc 179:69-179:70  V2
+testdata/Builtins.lc 179:69-179:70  c_
 testdata/Builtins.lc 179:75-179:76  Type
 testdata/Builtins.lc 179:75-179:89  Type
 testdata/Builtins.lc 179:80-179:81  Type
@@ -1808,14 +1808,14 @@ testdata/Builtins.lc 181:1-181:9  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float}
 testdata/Builtins.lc 181:11-181:19  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
 testdata/Builtins.lc 181:21-181:31  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
 testdata/Builtins.lc 182:34-182:67  Type
-testdata/Builtins.lc 182:35-182:36  V4
-testdata/Builtins.lc 182:35-182:38  V3->Type
+testdata/Builtins.lc 182:35-182:36  e_
+testdata/Builtins.lc 182:35-182:38  d_->Type
 testdata/Builtins.lc 182:35-182:56  Type
 testdata/Builtins.lc 182:37-182:38  {a} -> a -> a->Type
 testdata/Builtins.lc 182:39-182:48  Nat -> Type->Type
 testdata/Builtins.lc 182:39-182:50  Type->Type
 testdata/Builtins.lc 182:39-182:56  Type
-testdata/Builtins.lc 182:49-182:50  V1
+testdata/Builtins.lc 182:49-182:50  b_
 testdata/Builtins.lc 182:51-182:56  Type
 testdata/Builtins.lc 182:61-182:62  Type
 testdata/Builtins.lc 182:61-182:67  Type
@@ -1825,7 +1825,7 @@ testdata/Builtins.lc 184:34-184:43  Nat -> Type->Type
 testdata/Builtins.lc 184:34-184:45  Type->Type
 testdata/Builtins.lc 184:34-184:51  Type
 testdata/Builtins.lc 184:34-184:60  Type
-testdata/Builtins.lc 184:44-184:45  V1
+testdata/Builtins.lc 184:44-184:45  b_
 testdata/Builtins.lc 184:46-184:51  Type
 testdata/Builtins.lc 184:55-184:60  Type
 testdata/Builtins.lc 185:1-185:11  {a:Nat} -> VecScalar a Float -> Vec 2 Float
@@ -1833,80 +1833,80 @@ testdata/Builtins.lc 185:34-185:43  Nat -> Type->Type
 testdata/Builtins.lc 185:34-185:45  Type->Type
 testdata/Builtins.lc 185:34-185:51  Type
 testdata/Builtins.lc 185:34-185:66  Type
-testdata/Builtins.lc 185:44-185:45  V1
+testdata/Builtins.lc 185:44-185:45  b_
 testdata/Builtins.lc 185:46-185:51  Type
 testdata/Builtins.lc 185:55-185:58  Nat -> Type->Type
 testdata/Builtins.lc 185:55-185:60  Type->Type
 testdata/Builtins.lc 185:55-185:66  Type
-testdata/Builtins.lc 185:59-185:60  V1
+testdata/Builtins.lc 185:59-185:60  b_
 testdata/Builtins.lc 185:61-185:66  Type
 testdata/Builtins.lc 186:1-186:11  {a:Nat} -> VecScalar a Float -> Vec 3 Float
 testdata/Builtins.lc 186:34-186:43  Nat -> Type->Type
 testdata/Builtins.lc 186:34-186:45  Type->Type
 testdata/Builtins.lc 186:34-186:51  Type
 testdata/Builtins.lc 186:34-186:66  Type
-testdata/Builtins.lc 186:44-186:45  V1
+testdata/Builtins.lc 186:44-186:45  b_
 testdata/Builtins.lc 186:46-186:51  Type
 testdata/Builtins.lc 186:55-186:58  Nat -> Type->Type
 testdata/Builtins.lc 186:55-186:60  Type->Type
 testdata/Builtins.lc 186:55-186:66  Type
-testdata/Builtins.lc 186:59-186:60  V1
+testdata/Builtins.lc 186:59-186:60  b_
 testdata/Builtins.lc 186:61-186:66  Type
 testdata/Builtins.lc 187:1-187:11  {a:Nat} -> VecScalar a Float -> Vec 4 Float
 testdata/Builtins.lc 187:34-187:43  Nat -> Type->Type
 testdata/Builtins.lc 187:34-187:45  Type->Type
 testdata/Builtins.lc 187:34-187:51  Type
 testdata/Builtins.lc 187:34-187:66  Type
-testdata/Builtins.lc 187:44-187:45  V1
+testdata/Builtins.lc 187:44-187:45  b_
 testdata/Builtins.lc 187:46-187:51  Type
 testdata/Builtins.lc 187:55-187:58  Nat -> Type->Type
 testdata/Builtins.lc 187:55-187:60  Type->Type
 testdata/Builtins.lc 187:55-187:66  Type
-testdata/Builtins.lc 187:59-187:60  V1
+testdata/Builtins.lc 187:59-187:60  b_
 testdata/Builtins.lc 187:61-187:66  Type
 testdata/Builtins.lc 201:1-201:5  {a} -> List a -> a
-testdata/Builtins.lc 201:15-201:16  List V2 -> V2 | V1 -> List V2 -> V2 | V3
+testdata/Builtins.lc 201:15-201:16  List c_ -> c_ | b_ -> List c_ -> c_ | d_
 testdata/Builtins.lc 203:6-203:8  {a} -> List a -> List a -> List a
-testdata/Builtins.lc 203:14-203:16  V3
-testdata/Builtins.lc 203:14-204:26  List V0 -> List V1 | V0->V1
-testdata/Builtins.lc 204:14-204:15  V3
-testdata/Builtins.lc 204:14-204:17  List V2 -> List V3
-testdata/Builtins.lc 204:14-204:26  List V1 -> V4 | List V2 | V0 -> List V1 -> V4
+testdata/Builtins.lc 203:14-203:16  d_
+testdata/Builtins.lc 203:14-204:26  List a_ -> List b_ | a_->b_
+testdata/Builtins.lc 204:14-204:15  d_
+testdata/Builtins.lc 204:14-204:17  List c_ -> List d_
+testdata/Builtins.lc 204:14-204:26  List b_ -> e_ | List c_ | a_ -> List b_ -> e_
 testdata/Builtins.lc 204:16-204:17  {a} -> a -> List a -> List a
-testdata/Builtins.lc 204:18-204:20  List V5
-testdata/Builtins.lc 204:21-204:23  V7
-testdata/Builtins.lc 204:24-204:26  List V6
+testdata/Builtins.lc 204:18-204:20  List f_
+testdata/Builtins.lc 204:21-204:23  h_
+testdata/Builtins.lc 204:24-204:26  List g_
 testdata/Builtins.lc 206:1-206:6  {a} -> {b} -> (b -> a->a) -> a -> List b -> a
-testdata/Builtins.lc 206:16-206:17  V5
-testdata/Builtins.lc 206:16-207:39  List V1 -> V6 | V0->V1
-testdata/Builtins.lc 207:21-207:22  V8
-testdata/Builtins.lc 207:21-207:39  List V1 -> V6 | V0 -> List V1 -> V6
-testdata/Builtins.lc 207:23-207:24  V5
-testdata/Builtins.lc 207:26-207:31  V13
-testdata/Builtins.lc 207:32-207:33  V9->V7
-testdata/Builtins.lc 207:34-207:35  V14
-testdata/Builtins.lc 207:36-207:38  List V10
+testdata/Builtins.lc 206:16-206:17  f_
+testdata/Builtins.lc 206:16-207:39  List b_ -> g_ | a_->b_
+testdata/Builtins.lc 207:21-207:22  i_
+testdata/Builtins.lc 207:21-207:39  List b_ -> g_ | a_ -> List b_ -> g_
+testdata/Builtins.lc 207:23-207:24  f_
+testdata/Builtins.lc 207:26-207:31  n_
+testdata/Builtins.lc 207:32-207:33  j_->h_
+testdata/Builtins.lc 207:34-207:35  o_
+testdata/Builtins.lc 207:36-207:38  List k_
 testdata/Builtins.lc 209:1-209:7  {a} -> List (List a) -> List a
 testdata/Builtins.lc 209:10-209:15  {a} -> {b} -> (b -> a->a) -> a -> List b -> a
-testdata/Builtins.lc 209:10-209:20  List V0 -> List (List V1) -> List V2
-testdata/Builtins.lc 209:10-209:23  List (List V0) -> List V1
+testdata/Builtins.lc 209:10-209:20  List a_ -> List (List b_) -> List c_
+testdata/Builtins.lc 209:10-209:23  List (List a_) -> List b_
 testdata/Builtins.lc 209:16-209:20  {a} -> List a -> List a -> List a
 testdata/Builtins.lc 209:21-209:23  {a} -> List a
 testdata/Builtins.lc 211:1-211:4  {a} -> {b} -> a->b -> List a -> List b
 testdata/Builtins.lc 211:16-211:18  {a} -> List a
-testdata/Builtins.lc 211:16-212:30  List V1 -> List V1 | V0->V1
-testdata/Builtins.lc 212:16-212:17  V8
-testdata/Builtins.lc 212:16-212:21  List V0 -> List V1
-testdata/Builtins.lc 212:16-212:30  List V2 | List V2 -> List V2 | V1 -> List V2 -> List V2
-testdata/Builtins.lc 212:18-212:19  V7
+testdata/Builtins.lc 211:16-212:30  List b_ -> List b_ | a_->b_
+testdata/Builtins.lc 212:16-212:17  i_
+testdata/Builtins.lc 212:16-212:21  List a_ -> List b_
+testdata/Builtins.lc 212:16-212:30  List c_ | List c_ -> List c_ | b_ -> List c_ -> List c_
+testdata/Builtins.lc 212:18-212:19  h_
 testdata/Builtins.lc 212:20-212:21  {a} -> a -> List a -> List a
-testdata/Builtins.lc 212:22-212:25  V8
-testdata/Builtins.lc 212:26-212:27  V6->V6
-testdata/Builtins.lc 212:28-212:30  List V7
+testdata/Builtins.lc 212:22-212:25  i_
+testdata/Builtins.lc 212:26-212:27  g_->g_
+testdata/Builtins.lc 212:28-212:30  List h_
 testdata/Builtins.lc 214:14-214:38  Type
-testdata/Builtins.lc 214:15-214:16  V3
+testdata/Builtins.lc 214:15-214:16  d_
 testdata/Builtins.lc 214:20-214:23  Type
-testdata/Builtins.lc 214:21-214:22  V2
+testdata/Builtins.lc 214:21-214:22  c_
 testdata/Builtins.lc 214:28-214:31  Type
 testdata/Builtins.lc 214:28-214:38  Type
 testdata/Builtins.lc 214:29-214:30  Type
@@ -1914,28 +1914,28 @@ testdata/Builtins.lc 214:35-214:38  Type
 testdata/Builtins.lc 214:36-214:37  Type
 testdata/Builtins.lc 215:1-215:10  {a} -> {b} -> (a -> List b) -> List a -> List b
 testdata/Builtins.lc 215:17-215:23  {a} -> List (List a) -> List a
-testdata/Builtins.lc 215:17-215:33  (V1 -> List V1) -> List V2 -> List V2 | List V2 | List V2 -> List V2
+testdata/Builtins.lc 215:17-215:33  (b_ -> List b_) -> List c_ -> List c_ | List c_ | List c_ -> List c_
 testdata/Builtins.lc 215:25-215:28  {a} -> {b} -> a->b -> List a -> List b
-testdata/Builtins.lc 215:25-215:30  List V4 -> List (List V4)
-testdata/Builtins.lc 215:25-215:32  List (List V2)
-testdata/Builtins.lc 215:29-215:30  V6 -> List V6
-testdata/Builtins.lc 215:31-215:32  List V3
+testdata/Builtins.lc 215:25-215:30  List e_ -> List (List e_)
+testdata/Builtins.lc 215:25-215:32  List (List c_)
+testdata/Builtins.lc 215:29-215:30  g_ -> List g_
+testdata/Builtins.lc 215:31-215:32  List d_
 testdata/Builtins.lc 217:1-217:4  {a} -> List a -> Int
-testdata/Builtins.lc 217:10-217:11  V1
-testdata/Builtins.lc 217:10-218:35  List V1 -> Int | V0->V1
-testdata/Builtins.lc 218:14-218:15  V1
+testdata/Builtins.lc 217:10-217:11  b_
+testdata/Builtins.lc 217:10-218:35  List b_ -> Int | a_->b_
+testdata/Builtins.lc 218:14-218:15  b_
 testdata/Builtins.lc 218:14-218:28  Int->Int
-testdata/Builtins.lc 218:14-218:35  Int | List V3 -> V3 | V2 -> List V3 -> V3
+testdata/Builtins.lc 218:14-218:35  Int | List d_ -> d_ | c_ -> List d_ -> d_
 testdata/Builtins.lc 218:16-218:28  Int -> Int->Int
-testdata/Builtins.lc 218:29-218:32  V7
-testdata/Builtins.lc 218:33-218:35  List V6
+testdata/Builtins.lc 218:29-218:32  h_
+testdata/Builtins.lc 218:33-218:35  List g_
 testdata/Builtins.lc 222:6-222:11  Type | Type->Type
 testdata/Builtins.lc 222:6-222:13  Type
 testdata/Builtins.lc 222:6-224:11  Type
 testdata/Builtins.lc 222:6-224:13  Type
 testdata/Builtins.lc 222:12-222:13  Type
-testdata/Builtins.lc 223:7-223:14  Maybe V1 | {a} -> Maybe a
-testdata/Builtins.lc 224:7-224:11  Maybe V3 | Type | {a} -> a -> Maybe a
+testdata/Builtins.lc 223:7-223:14  Maybe b_ | {a} -> Maybe a
+testdata/Builtins.lc 224:7-224:11  Maybe d_ | Type | {a} -> a -> Maybe a
 testdata/Builtins.lc 224:12-224:13  Type
 testdata/Builtins.lc 227:6-227:12  Nat -> Type->Type | Type
 testdata/Builtins.lc 227:19-227:22  Type
@@ -1951,7 +1951,7 @@ testdata/Builtins.lc 238:6-241:56  Type
 testdata/Builtins.lc 238:21-238:34  Type
 testdata/Builtins.lc 238:21-238:42  Type
 testdata/Builtins.lc 238:38-238:42  Type
-testdata/Builtins.lc 239:5-239:14  Primitive V2 'Point | {a} -> a -> Primitive a 'Point
+testdata/Builtins.lc 239:5-239:14  Primitive c_ 'Point | {a} -> a -> Primitive a 'Point
 testdata/Builtins.lc 239:5-239:53  Type
 testdata/Builtins.lc 239:21-239:22  Type
 testdata/Builtins.lc 239:21-239:53  Type
@@ -1960,7 +1960,7 @@ testdata/Builtins.lc 239:36-239:47  PrimitiveType->Type
 testdata/Builtins.lc 239:36-239:53  Type
 testdata/Builtins.lc 239:46-239:47  Type
 testdata/Builtins.lc 239:48-239:53  PrimitiveType
-testdata/Builtins.lc 240:5-240:13  Primitive V4 'Line | {a} -> a -> a -> Primitive a 'Line
+testdata/Builtins.lc 240:5-240:13  Primitive e_ 'Line | {a} -> a -> a -> Primitive a 'Line
 testdata/Builtins.lc 240:5-240:52  Type
 testdata/Builtins.lc 240:21-240:22  Type
 testdata/Builtins.lc 240:21-240:52  Type
@@ -1971,7 +1971,7 @@ testdata/Builtins.lc 240:36-240:47  PrimitiveType->Type
 testdata/Builtins.lc 240:36-240:52  Type
 testdata/Builtins.lc 240:46-240:47  Type
 testdata/Builtins.lc 240:48-240:52  PrimitiveType
-testdata/Builtins.lc 241:5-241:17  Primitive V6 'Triangle | {a} -> a -> a -> a -> Primitive a 'Triangle
+testdata/Builtins.lc 241:5-241:17  Primitive g_ 'Triangle | {a} -> a -> a -> a -> Primitive a 'Triangle
 testdata/Builtins.lc 241:5-241:56  Type
 testdata/Builtins.lc 241:21-241:22  Type
 testdata/Builtins.lc 241:21-241:56  Type
@@ -1986,14 +1986,14 @@ testdata/Builtins.lc 241:46-241:47  Type
 testdata/Builtins.lc 241:48-241:56  PrimitiveType
 testdata/Builtins.lc 243:1-243:13  {a} -> {b} -> {c:PrimitiveType} -> a->b -> Primitive a c -> Primitive b c
 testdata/Builtins.lc 243:17-243:59  Type
-testdata/Builtins.lc 243:18-243:19  V5
-testdata/Builtins.lc 243:23-243:24  Type | V4
+testdata/Builtins.lc 243:18-243:19  f_
+testdata/Builtins.lc 243:23-243:24  Type | e_
 testdata/Builtins.lc 243:29-243:38  Type -> PrimitiveType->Type
 testdata/Builtins.lc 243:29-243:40  PrimitiveType->Type
 testdata/Builtins.lc 243:29-243:42  Type
 testdata/Builtins.lc 243:29-243:59  Type
 testdata/Builtins.lc 243:39-243:40  Type
-testdata/Builtins.lc 243:41-243:42  V2
+testdata/Builtins.lc 243:41-243:42  c_
 testdata/Builtins.lc 243:46-243:55  Type -> PrimitiveType->Type
 testdata/Builtins.lc 243:46-243:57  PrimitiveType->Type
 testdata/Builtins.lc 243:46-243:59  Type
@@ -2004,16 +2004,16 @@ testdata/Builtins.lc 250:28-250:43  Type
 testdata/Builtins.lc 250:29-250:38  Type -> PrimitiveType->Type
 testdata/Builtins.lc 250:29-250:40  PrimitiveType->Type
 testdata/Builtins.lc 250:29-250:42  Type
-testdata/Builtins.lc 250:39-250:40  V1
-testdata/Builtins.lc 250:41-250:42  V2
+testdata/Builtins.lc 250:39-250:40  b_
+testdata/Builtins.lc 250:41-250:42  c_
 testdata/Builtins.lc 252:18-252:72  Type
-testdata/Builtins.lc 252:19-252:20  V5
-testdata/Builtins.lc 252:24-252:25  Type | V4
+testdata/Builtins.lc 252:19-252:20  f_
+testdata/Builtins.lc 252:24-252:25  Type | e_
 testdata/Builtins.lc 252:30-252:45  PrimitiveType -> Type->Type
 testdata/Builtins.lc 252:30-252:47  Type->Type
 testdata/Builtins.lc 252:30-252:49  Type
 testdata/Builtins.lc 252:30-252:72  Type
-testdata/Builtins.lc 252:46-252:47  V2
+testdata/Builtins.lc 252:46-252:47  c_
 testdata/Builtins.lc 252:48-252:49  Type
 testdata/Builtins.lc 252:53-252:68  PrimitiveType -> Type->Type
 testdata/Builtins.lc 252:53-252:70  Type->Type
@@ -2022,23 +2022,23 @@ testdata/Builtins.lc 252:69-252:70  PrimitiveType
 testdata/Builtins.lc 252:71-252:72  Type
 testdata/Builtins.lc 253:1-253:14  {a} -> {b} -> {c:PrimitiveType} -> a->b -> List (Primitive a c) -> List (Primitive b c)
 testdata/Builtins.lc 253:19-253:22  {a} -> {b} -> a->b -> List a -> List b
-testdata/Builtins.lc 253:19-253:39  List (Primitive V4 V0) -> List (Primitive V4 V1) | V2->V2 -> PrimitiveStream V1 V3 -> PrimitiveStream V2 V3
+testdata/Builtins.lc 253:19-253:39  List (Primitive e_ a_) -> List (Primitive e_ b_) | c_->c_ -> PrimitiveStream b_ d_ -> PrimitiveStream c_ d_
 testdata/Builtins.lc 253:24-253:36  {a} -> {b} -> {c:PrimitiveType} -> a->b -> Primitive a c -> Primitive b c
-testdata/Builtins.lc 253:24-253:38  Primitive V6 V0 -> Primitive V6 V1
-testdata/Builtins.lc 253:37-253:38  V8->V8
+testdata/Builtins.lc 253:24-253:38  Primitive g_ a_ -> Primitive g_ b_
+testdata/Builtins.lc 253:37-253:38  i_->i_
 testdata/Builtins.lc 255:30-255:38  Type->Type
 testdata/Builtins.lc 255:45-255:46  Type | Type->Type
 testdata/Builtins.lc 260:1-260:12  {a:PrimitiveType} -> {b : List Type} -> {c : List Type} -> {_ : b ~ 'map Type Type ListElem c} -> HList c -> PrimitiveStream a (HList b)
 testdata/Builtins.lc 260:32-260:119  Type
-testdata/Builtins.lc 260:56-260:57  V4
-testdata/Builtins.lc 260:56-260:59  V3->Type
+testdata/Builtins.lc 260:56-260:57  e_
+testdata/Builtins.lc 260:56-260:59  d_->Type
 testdata/Builtins.lc 260:56-260:75  Type
 testdata/Builtins.lc 260:58-260:59  {a} -> a -> a->Type
 testdata/Builtins.lc 260:60-260:63  {a} -> {b} -> a->b -> List a -> List b
 testdata/Builtins.lc 260:60-260:72  List Type -> List Type
 testdata/Builtins.lc 260:60-260:75  List Type
 testdata/Builtins.lc 260:64-260:72  Type->Type
-testdata/Builtins.lc 260:73-260:75  V1
+testdata/Builtins.lc 260:73-260:75  b_
 testdata/Builtins.lc 260:80-260:85  List Type -> Type
 testdata/Builtins.lc 260:80-260:88  Type
 testdata/Builtins.lc 260:80-260:119  Type
@@ -2046,7 +2046,7 @@ testdata/Builtins.lc 260:86-260:88  List Type
 testdata/Builtins.lc 260:92-260:107  PrimitiveType -> Type->Type
 testdata/Builtins.lc 260:92-260:109  Type->Type
 testdata/Builtins.lc 260:92-260:119  Type
-testdata/Builtins.lc 260:108-260:109  V5
+testdata/Builtins.lc 260:108-260:109  f_
 testdata/Builtins.lc 260:111-260:116  List Type -> Type
 testdata/Builtins.lc 260:111-260:118  Type
 testdata/Builtins.lc 260:117-260:118  List Type
@@ -2056,18 +2056,18 @@ testdata/Builtins.lc 262:56-262:104  Type
 testdata/Builtins.lc 262:66-262:71  List Type -> Type
 testdata/Builtins.lc 262:66-262:73  Type
 testdata/Builtins.lc 262:66-262:104  Type
-testdata/Builtins.lc 262:72-262:73  V2
+testdata/Builtins.lc 262:72-262:73  c_
 testdata/Builtins.lc 262:77-262:92  PrimitiveType -> Type->Type
 testdata/Builtins.lc 262:77-262:94  Type->Type
 testdata/Builtins.lc 262:77-262:104  Type
-testdata/Builtins.lc 262:93-262:94  V4
+testdata/Builtins.lc 262:93-262:94  e_
 testdata/Builtins.lc 262:96-262:101  List Type -> Type
 testdata/Builtins.lc 262:96-262:103  Type
 testdata/Builtins.lc 262:102-262:103  List Type
 testdata/Builtins.lc 264:1-264:10  {a} -> String->a
 testdata/Builtins.lc 264:14-264:20  Type
 testdata/Builtins.lc 264:14-264:25  Type
-testdata/Builtins.lc 264:24-264:25  Type | V2
+testdata/Builtins.lc 264:24-264:25  Type | c_
 testdata/Builtins.lc 266:1-266:12  {a:PrimitiveType} -> {b : List Type} -> String -> (c : List String) -> {_ : 'len String c ~ 'len Type b} -> PrimitiveStream a (HList b)
 testdata/Builtins.lc 266:31-266:37  Type
 testdata/Builtins.lc 266:31-266:123  Type
@@ -2090,7 +2090,7 @@ testdata/Builtins.lc 266:91-266:92  List Type
 testdata/Builtins.lc 266:96-266:111  PrimitiveType -> Type->Type
 testdata/Builtins.lc 266:96-266:113  Type->Type
 testdata/Builtins.lc 266:96-266:123  Type
-testdata/Builtins.lc 266:112-266:113  V5
+testdata/Builtins.lc 266:112-266:113  f_
 testdata/Builtins.lc 266:115-266:120  List Type -> Type
 testdata/Builtins.lc 266:115-266:122  Type
 testdata/Builtins.lc 266:121-266:122  List Type
@@ -2098,23 +2098,23 @@ testdata/Builtins.lc 270:6-270:14  Nat -> Type->Type
 testdata/Builtins.lc 270:21-270:27  Nat -> Type->Type
 testdata/Builtins.lc 270:21-270:29  Type->Type
 testdata/Builtins.lc 270:21-270:56  Type
-testdata/Builtins.lc 270:28-270:29  V3
+testdata/Builtins.lc 270:28-270:29  d_
 testdata/Builtins.lc 270:31-270:36  Type->Type
 testdata/Builtins.lc 270:31-270:55  Type
 testdata/Builtins.lc 270:38-270:52  Type->Type
 testdata/Builtins.lc 270:38-270:54  Type
-testdata/Builtins.lc 270:53-270:54  V1
+testdata/Builtins.lc 270:53-270:54  b_
 testdata/Builtins.lc 272:6-272:20  Type | Type->Type
 testdata/Builtins.lc 272:6-272:22  Type
 testdata/Builtins.lc 272:6-272:39  Type
 testdata/Builtins.lc 272:6-274:29  Type
 testdata/Builtins.lc 272:21-272:22  Type
-testdata/Builtins.lc 272:25-272:39  SimpleFragment V3 | Type | {a} -> Vec 3 Float -> a -> SimpleFragment a
+testdata/Builtins.lc 272:25-272:39  SimpleFragment d_ | Type | {a} -> Vec 3 Float -> a -> SimpleFragment a
 testdata/Builtins.lc 273:7-273:22  {a} -> SimpleFragment a -> VecS Float 3
 testdata/Builtins.lc 273:28-273:31  Nat -> Type->Type
 testdata/Builtins.lc 273:28-273:33  Type->Type
 testdata/Builtins.lc 273:28-273:39  Type
-testdata/Builtins.lc 273:32-273:33  V1
+testdata/Builtins.lc 273:32-273:33  b_
 testdata/Builtins.lc 273:34-273:39  Type
 testdata/Builtins.lc 274:7-274:21  {a} -> SimpleFragment a -> a
 testdata/Builtins.lc 274:28-274:29  Type
@@ -2123,17 +2123,17 @@ testdata/Builtins.lc 277:27-277:41  Type
 testdata/Builtins.lc 277:28-277:36  Nat -> Type->Type
 testdata/Builtins.lc 277:28-277:38  Type->Type
 testdata/Builtins.lc 277:28-277:40  Type
-testdata/Builtins.lc 277:37-277:38  V3
-testdata/Builtins.lc 277:39-277:40  V1
+testdata/Builtins.lc 277:37-277:38  d_
+testdata/Builtins.lc 277:39-277:40  b_
 testdata/Builtins.lc 279:1-279:15  {a} -> {b:Nat} -> a->Float -> Fragment b a -> Fragment b a
 testdata/Builtins.lc 279:19-279:63  Type
-testdata/Builtins.lc 279:20-279:21  V3
+testdata/Builtins.lc 279:20-279:21  d_
 testdata/Builtins.lc 279:25-279:30  Type
 testdata/Builtins.lc 279:35-279:43  Nat -> Type->Type
 testdata/Builtins.lc 279:35-279:45  Type->Type
 testdata/Builtins.lc 279:35-279:47  Type
 testdata/Builtins.lc 279:35-279:63  Type
-testdata/Builtins.lc 279:44-279:45  V2
+testdata/Builtins.lc 279:44-279:45  c_
 testdata/Builtins.lc 279:46-279:47  Type
 testdata/Builtins.lc 279:51-279:59  Nat -> Type->Type
 testdata/Builtins.lc 279:51-279:61  Type->Type
@@ -2141,13 +2141,13 @@ testdata/Builtins.lc 279:51-279:63  Type
 testdata/Builtins.lc 279:60-279:61  Nat
 testdata/Builtins.lc 279:62-279:63  Type
 testdata/Builtins.lc 281:20-281:76  Type
-testdata/Builtins.lc 281:21-281:22  V3
+testdata/Builtins.lc 281:21-281:22  d_
 testdata/Builtins.lc 281:26-281:31  Type
 testdata/Builtins.lc 281:36-281:50  Nat -> Type->Type
 testdata/Builtins.lc 281:36-281:52  Type->Type
 testdata/Builtins.lc 281:36-281:54  Type
 testdata/Builtins.lc 281:36-281:76  Type
-testdata/Builtins.lc 281:51-281:52  V2
+testdata/Builtins.lc 281:51-281:52  c_
 testdata/Builtins.lc 281:53-281:54  Type
 testdata/Builtins.lc 281:58-281:72  Nat -> Type->Type
 testdata/Builtins.lc 281:58-281:74  Type->Type
@@ -2156,19 +2156,19 @@ testdata/Builtins.lc 281:73-281:74  Nat
 testdata/Builtins.lc 281:75-281:76  Type
 testdata/Builtins.lc 282:1-282:16  {a} -> {b:Nat} -> a->Float -> List (Vector b (Maybe (SimpleFragment a))) -> List (Vector b (Maybe (SimpleFragment a)))
 testdata/Builtins.lc 282:21-282:24  {a} -> {b} -> a->b -> List a -> List b
-testdata/Builtins.lc 282:21-282:43  List (Vector V0 (Maybe (SimpleFragment V3))) -> List (Vector V1 (Maybe (SimpleFragment V4))) | V1->Float -> FragmentStream V1 V2 -> FragmentStream V2 V3
+testdata/Builtins.lc 282:21-282:43  List (Vector a_ (Maybe (SimpleFragment d_))) -> List (Vector b_ (Maybe (SimpleFragment e_))) | b_->Float -> FragmentStream b_ c_ -> FragmentStream c_ d_
 testdata/Builtins.lc 282:26-282:40  {a} -> {b:Nat} -> a->Float -> Fragment b a -> Fragment b a
-testdata/Builtins.lc 282:26-282:42  Fragment V0 V5 -> Fragment V1 V6
-testdata/Builtins.lc 282:41-282:42  V6->Float
+testdata/Builtins.lc 282:26-282:42  Fragment a_ f_ -> Fragment b_ g_
+testdata/Builtins.lc 282:41-282:42  g_->Float
 testdata/Builtins.lc 284:1-284:15  {a} -> {b:Nat} -> a->Bool -> Fragment b a -> Fragment b a
 testdata/Builtins.lc 284:19-284:62  Type
-testdata/Builtins.lc 284:20-284:21  V3
+testdata/Builtins.lc 284:20-284:21  d_
 testdata/Builtins.lc 284:25-284:29  Type
 testdata/Builtins.lc 284:34-284:42  Nat -> Type->Type
 testdata/Builtins.lc 284:34-284:44  Type->Type
 testdata/Builtins.lc 284:34-284:46  Type
 testdata/Builtins.lc 284:34-284:62  Type
-testdata/Builtins.lc 284:43-284:44  V2
+testdata/Builtins.lc 284:43-284:44  c_
 testdata/Builtins.lc 284:45-284:46  Type
 testdata/Builtins.lc 284:50-284:58  Nat -> Type->Type
 testdata/Builtins.lc 284:50-284:60  Type->Type
@@ -2176,13 +2176,13 @@ testdata/Builtins.lc 284:50-284:62  Type
 testdata/Builtins.lc 284:59-284:60  Nat
 testdata/Builtins.lc 284:61-284:62  Type
 testdata/Builtins.lc 286:20-286:75  Type
-testdata/Builtins.lc 286:21-286:22  V3
+testdata/Builtins.lc 286:21-286:22  d_
 testdata/Builtins.lc 286:26-286:30  Type
 testdata/Builtins.lc 286:35-286:49  Nat -> Type->Type
 testdata/Builtins.lc 286:35-286:51  Type->Type
 testdata/Builtins.lc 286:35-286:53  Type
 testdata/Builtins.lc 286:35-286:75  Type
-testdata/Builtins.lc 286:50-286:51  V2
+testdata/Builtins.lc 286:50-286:51  c_
 testdata/Builtins.lc 286:52-286:53  Type
 testdata/Builtins.lc 286:57-286:71  Nat -> Type->Type
 testdata/Builtins.lc 286:57-286:73  Type->Type
@@ -2191,19 +2191,19 @@ testdata/Builtins.lc 286:72-286:73  Nat
 testdata/Builtins.lc 286:74-286:75  Type
 testdata/Builtins.lc 287:1-287:16  {a} -> {b:Nat} -> a->Bool -> List (Vector b (Maybe (SimpleFragment a))) -> List (Vector b (Maybe (SimpleFragment a)))
 testdata/Builtins.lc 287:21-287:24  {a} -> {b} -> a->b -> List a -> List b
-testdata/Builtins.lc 287:21-287:43  List (Vector V0 (Maybe (SimpleFragment V3))) -> List (Vector V1 (Maybe (SimpleFragment V4))) | V1->Bool -> FragmentStream V1 V2 -> FragmentStream V2 V3
+testdata/Builtins.lc 287:21-287:43  List (Vector a_ (Maybe (SimpleFragment d_))) -> List (Vector b_ (Maybe (SimpleFragment e_))) | b_->Bool -> FragmentStream b_ c_ -> FragmentStream c_ d_
 testdata/Builtins.lc 287:26-287:40  {a} -> {b:Nat} -> a->Bool -> Fragment b a -> Fragment b a
-testdata/Builtins.lc 287:26-287:42  Fragment V0 V5 -> Fragment V1 V6
-testdata/Builtins.lc 287:41-287:42  V6->Bool
+testdata/Builtins.lc 287:26-287:42  Fragment a_ f_ -> Fragment b_ g_
+testdata/Builtins.lc 287:41-287:42  g_->Bool
 testdata/Builtins.lc 289:1-289:12  {a} -> {b} -> {c:Nat} -> a->b -> Fragment c a -> Fragment c b
 testdata/Builtins.lc 289:16-289:56  Type
-testdata/Builtins.lc 289:17-289:18  V5
-testdata/Builtins.lc 289:22-289:23  Type | V4
+testdata/Builtins.lc 289:17-289:18  f_
+testdata/Builtins.lc 289:22-289:23  Type | e_
 testdata/Builtins.lc 289:28-289:36  Nat -> Type->Type
 testdata/Builtins.lc 289:28-289:38  Type->Type
 testdata/Builtins.lc 289:28-289:40  Type
 testdata/Builtins.lc 289:28-289:56  Type
-testdata/Builtins.lc 289:37-289:38  V2
+testdata/Builtins.lc 289:37-289:38  c_
 testdata/Builtins.lc 289:39-289:40  Type
 testdata/Builtins.lc 289:44-289:52  Nat -> Type->Type
 testdata/Builtins.lc 289:44-289:54  Type->Type
@@ -2211,13 +2211,13 @@ testdata/Builtins.lc 289:44-289:56  Type
 testdata/Builtins.lc 289:53-289:54  Nat
 testdata/Builtins.lc 289:55-289:56  Type
 testdata/Builtins.lc 291:17-291:69  Type
-testdata/Builtins.lc 291:18-291:19  V5
-testdata/Builtins.lc 291:23-291:24  Type | V4
+testdata/Builtins.lc 291:18-291:19  f_
+testdata/Builtins.lc 291:23-291:24  Type | e_
 testdata/Builtins.lc 291:29-291:43  Nat -> Type->Type
 testdata/Builtins.lc 291:29-291:45  Type->Type
 testdata/Builtins.lc 291:29-291:47  Type
 testdata/Builtins.lc 291:29-291:69  Type
-testdata/Builtins.lc 291:44-291:45  V2
+testdata/Builtins.lc 291:44-291:45  c_
 testdata/Builtins.lc 291:46-291:47  Type
 testdata/Builtins.lc 291:51-291:65  Nat -> Type->Type
 testdata/Builtins.lc 291:51-291:67  Type->Type
@@ -2226,10 +2226,10 @@ testdata/Builtins.lc 291:66-291:67  Nat
 testdata/Builtins.lc 291:68-291:69  Type
 testdata/Builtins.lc 292:1-292:13  {a} -> {b} -> {c:Nat} -> a->b -> List (Vector c (Maybe (SimpleFragment a))) -> List (Vector c (Maybe (SimpleFragment b)))
 testdata/Builtins.lc 292:18-292:21  {a} -> {b} -> a->b -> List a -> List b
-testdata/Builtins.lc 292:18-292:37  List (Vector V0 (Maybe (SimpleFragment V4))) -> List (Vector V1 (Maybe (SimpleFragment V4))) | V2->V2 -> FragmentStream V1 V3 -> FragmentStream V2 V3
+testdata/Builtins.lc 292:18-292:37  List (Vector a_ (Maybe (SimpleFragment e_))) -> List (Vector b_ (Maybe (SimpleFragment e_))) | c_->c_ -> FragmentStream b_ d_ -> FragmentStream c_ d_
 testdata/Builtins.lc 292:23-292:34  {a} -> {b} -> {c:Nat} -> a->b -> Fragment c a -> Fragment c b
-testdata/Builtins.lc 292:23-292:36  Fragment V0 V6 -> Fragment V1 V6
-testdata/Builtins.lc 292:35-292:36  V8->V8
+testdata/Builtins.lc 292:23-292:36  Fragment a_ g_ -> Fragment b_ g_
+testdata/Builtins.lc 292:35-292:36  i_->i_
 testdata/Builtins.lc 296:6-296:15  Type
 testdata/Builtins.lc 296:6-299:14  Type
 testdata/Builtins.lc 297:7-297:12  ImageKind | Type | Type->ImageKind
@@ -2239,7 +2239,7 @@ testdata/Builtins.lc 299:7-299:14  ImageKind
 testdata/Builtins.lc 301:14-301:23  Type
 testdata/Builtins.lc 301:27-301:31  Type
 testdata/Builtins.lc 302:1-302:10  ImageKind->Type
-testdata/Builtins.lc 302:23-302:24  Type | Type->V1
+testdata/Builtins.lc 302:23-302:24  Type | Type->b_
 testdata/Builtins.lc 302:23-303:25  Type -> ImageKind->Type
 testdata/Builtins.lc 302:23-304:25  ImageKind->Type | Type
 testdata/Builtins.lc 303:19-303:25  Type
@@ -2252,23 +2252,23 @@ testdata/Builtins.lc 308:1-308:11  {a:Nat} -> {b:Nat} -> {c} -> {d} -> {_ : Num
 testdata/Builtins.lc 308:45-309:55  Type
 testdata/Builtins.lc 308:46-308:49  Type->Type
 testdata/Builtins.lc 308:46-308:51  Type
-testdata/Builtins.lc 308:50-308:51  V3
-testdata/Builtins.lc 308:53-308:58  V3
-testdata/Builtins.lc 308:53-308:60  V2->Type
+testdata/Builtins.lc 308:50-308:51  d_
+testdata/Builtins.lc 308:53-308:58  d_
+testdata/Builtins.lc 308:53-308:60  c_->Type
 testdata/Builtins.lc 308:53-308:74  Type
 testdata/Builtins.lc 308:53-309:55  Type
 testdata/Builtins.lc 308:59-308:60  {a} -> a -> a->Type
 testdata/Builtins.lc 308:61-308:70  Nat -> Type->Type
 testdata/Builtins.lc 308:61-308:72  Type->Type
 testdata/Builtins.lc 308:61-308:74  Type
-testdata/Builtins.lc 308:71-308:72  V5
+testdata/Builtins.lc 308:71-308:72  f_
 testdata/Builtins.lc 308:73-308:74  Type
 testdata/Builtins.lc 309:24-309:29  Type
 testdata/Builtins.lc 309:24-309:55  Type
 testdata/Builtins.lc 309:34-309:39  Nat -> ImageKind->Type
 testdata/Builtins.lc 309:34-309:41  ImageKind->Type
 testdata/Builtins.lc 309:34-309:55  Type
-testdata/Builtins.lc 309:40-309:41  V7
+testdata/Builtins.lc 309:40-309:41  h_
 testdata/Builtins.lc 309:43-309:48  Type->ImageKind
 testdata/Builtins.lc 309:43-309:54  ImageKind
 testdata/Builtins.lc 309:49-309:54  Type
@@ -2278,7 +2278,7 @@ testdata/Builtins.lc 310:35-310:58  Type
 testdata/Builtins.lc 310:45-310:50  Nat -> ImageKind->Type
 testdata/Builtins.lc 310:45-310:52  ImageKind->Type
 testdata/Builtins.lc 310:45-310:58  Type
-testdata/Builtins.lc 310:51-310:52  V2
+testdata/Builtins.lc 310:51-310:52  c_
 testdata/Builtins.lc 310:53-310:58  ImageKind
 testdata/Builtins.lc 311:1-311:13  {a:Nat} -> Int -> Image a 'Stencil
 testdata/Builtins.lc 311:35-311:38  Type
@@ -2286,16 +2286,16 @@ testdata/Builtins.lc 311:35-311:60  Type
 testdata/Builtins.lc 311:45-311:50  Nat -> ImageKind->Type
 testdata/Builtins.lc 311:45-311:52  ImageKind->Type
 testdata/Builtins.lc 311:45-311:60  Type
-testdata/Builtins.lc 311:51-311:52  V2
+testdata/Builtins.lc 311:51-311:52  c_
 testdata/Builtins.lc 311:53-311:60  ImageKind
 testdata/Builtins.lc 313:1-313:16  Float -> Image 1 'Depth
 testdata/Builtins.lc 313:19-313:29  {a:Nat} -> Float -> Image a 'Depth
 testdata/Builtins.lc 313:19-313:32  Float -> Image 1 'Depth
-testdata/Builtins.lc 313:31-313:32  V1
+testdata/Builtins.lc 313:31-313:32  b_
 testdata/Builtins.lc 314:1-314:16  {a:Nat} -> {b} -> {c} -> {_ : Num b} -> {_ : c ~ VecScalar a b} -> c -> Image 1 ('Color c)
 testdata/Builtins.lc 314:19-314:29  {a:Nat} -> {b:Nat} -> {c} -> {d} -> {_ : Num c} -> {_ : d ~ VecScalar b c} -> d -> Image a ('Color d)
 testdata/Builtins.lc 314:19-314:32  {a:Nat} -> {b} -> {c} -> {_ : Num b} -> {_ : c ~ VecScalar a b} -> c -> Image 1 ('Color c)
-testdata/Builtins.lc 314:31-314:32  V1
+testdata/Builtins.lc 314:31-314:32  b_
 testdata/Builtins.lc 321:6-321:11  Type
 testdata/Builtins.lc 321:6-321:31  Type
 testdata/Builtins.lc 321:14-321:16  Swizz
@@ -2307,55 +2307,55 @@ testdata/Builtins.lc 339:27-339:30  Nat -> Type->Type
 testdata/Builtins.lc 339:27-339:32  Type->Type
 testdata/Builtins.lc 339:27-339:34  Type
 testdata/Builtins.lc 339:27-339:48  Type
-testdata/Builtins.lc 339:31-339:32  V1
-testdata/Builtins.lc 339:33-339:34  V2
+testdata/Builtins.lc 339:31-339:32  b_
+testdata/Builtins.lc 339:33-339:34  c_
 testdata/Builtins.lc 339:38-339:43  Type
 testdata/Builtins.lc 339:38-339:48  Type
 testdata/Builtins.lc 339:47-339:48  Type
 testdata/Builtins.lc 340:1-340:12  {a} -> {b:Nat} -> Vec b a -> Swizz->a
-testdata/Builtins.lc 340:27-340:28  V4
-testdata/Builtins.lc 340:27-341:28  V1 -> V2->V2 | V2 | V2->V2 | V3 -> V4 -> Swizz->V6
-testdata/Builtins.lc 340:27-344:30  (V0 -> V1 -> V2 -> V3->V4) -> {a:Nat} -> VecS V2 a -> V3
-testdata/Builtins.lc 340:27-348:32  Swizz->V3 | V3 | Vec V0 V1 -> Swizz->V3 | {a:Nat} -> VecS V1 a -> V2
-testdata/Builtins.lc 341:27-341:28  V3
-testdata/Builtins.lc 342:29-342:30  V4
-testdata/Builtins.lc 342:29-343:30  V3 -> V4 -> Swizz->V6
-testdata/Builtins.lc 342:29-344:30  V0 -> V1 -> V2->V3 | V1 -> V2->V3 | V2->V3 | V3 | V3 -> Swizz->V5
-testdata/Builtins.lc 343:29-343:30  V3
-testdata/Builtins.lc 344:29-344:30  V3
-testdata/Builtins.lc 345:31-345:32  V5
-testdata/Builtins.lc 345:31-346:32  V4 -> V5 -> Swizz->V7
-testdata/Builtins.lc 345:31-347:32  V4 -> Swizz->V6
-testdata/Builtins.lc 345:31-348:32  Swizz->V5 | V0 -> V1 -> V2 -> V3->V4 | V1 -> V2 -> V3->V4 | V2 -> V3->V4 | V3->V4 | V4
-testdata/Builtins.lc 346:31-346:32  V4
-testdata/Builtins.lc 347:31-347:32  V4
-testdata/Builtins.lc 348:31-348:32  V4
+testdata/Builtins.lc 340:27-340:28  e_
+testdata/Builtins.lc 340:27-341:28  b_ -> c_->c_ | c_ | c_->c_ | d_ -> e_ -> Swizz->g_
+testdata/Builtins.lc 340:27-344:30  (a_ -> b_ -> c_ -> d_->e_) -> {a:Nat} -> VecS c_ a -> d_
+testdata/Builtins.lc 340:27-348:32  Swizz->d_ | Vec a_ b_ -> Swizz->d_ | d_ | {a:Nat} -> VecS b_ a -> c_
+testdata/Builtins.lc 341:27-341:28  d_
+testdata/Builtins.lc 342:29-342:30  e_
+testdata/Builtins.lc 342:29-343:30  d_ -> e_ -> Swizz->g_
+testdata/Builtins.lc 342:29-344:30  a_ -> b_ -> c_->d_ | b_ -> c_->d_ | c_->d_ | d_ | d_ -> Swizz->f_
+testdata/Builtins.lc 343:29-343:30  d_
+testdata/Builtins.lc 344:29-344:30  d_
+testdata/Builtins.lc 345:31-345:32  f_
+testdata/Builtins.lc 345:31-346:32  e_ -> f_ -> Swizz->h_
+testdata/Builtins.lc 345:31-347:32  e_ -> Swizz->g_
+testdata/Builtins.lc 345:31-348:32  Swizz->f_ | a_ -> b_ -> c_ -> d_->e_ | b_ -> c_ -> d_->e_ | c_ -> d_->e_ | d_->e_ | e_
+testdata/Builtins.lc 346:31-346:32  e_
+testdata/Builtins.lc 347:31-347:32  e_
+testdata/Builtins.lc 348:31-348:32  e_
 testdata/Builtins.lc 351:28-351:31  Nat -> Type->Type
 testdata/Builtins.lc 351:28-351:33  Type->Type
 testdata/Builtins.lc 351:28-351:35  Type
 testdata/Builtins.lc 351:28-351:43  Type
-testdata/Builtins.lc 351:32-351:33  V1
-testdata/Builtins.lc 351:34-351:35  V2
+testdata/Builtins.lc 351:32-351:33  b_
+testdata/Builtins.lc 351:34-351:35  c_
 testdata/Builtins.lc 351:39-351:43  Type
 testdata/Builtins.lc 352:1-352:11  {a} -> {b:Nat} -> Vec b a -> Bool
-testdata/Builtins.lc 352:23-352:27  Bool | V1 -> V2->V2 | V2->V2
-testdata/Builtins.lc 352:23-353:29  (V0 -> V1 -> V2 -> V3->Bool) -> {a:Nat} -> VecS V2 a -> Bool
-testdata/Builtins.lc 352:23-354:31  Bool | Vec V0 V1 -> Bool | {a:Nat} -> VecS V1 a -> Bool
-testdata/Builtins.lc 353:25-353:29  Bool | V0 -> V1 -> V2->Bool | V1 -> V2->Bool | V2->Bool
-testdata/Builtins.lc 354:27-354:31  Bool | V0 -> V1 -> V2 -> V3->Bool | V1 -> V2 -> V3->Bool | V2 -> V3->Bool | V3->Bool
+testdata/Builtins.lc 352:23-352:27  Bool | b_ -> c_->c_ | c_->c_
+testdata/Builtins.lc 352:23-353:29  (a_ -> b_ -> c_ -> d_->Bool) -> {a:Nat} -> VecS c_ a -> Bool
+testdata/Builtins.lc 352:23-354:31  Bool | Vec a_ b_ -> Bool | {a:Nat} -> VecS b_ a -> Bool
+testdata/Builtins.lc 353:25-353:29  Bool | a_ -> b_ -> c_->Bool | b_ -> c_->Bool | c_->Bool
+testdata/Builtins.lc 354:27-354:31  Bool | a_ -> b_ -> c_ -> d_->Bool | b_ -> c_ -> d_->Bool | c_ -> d_->Bool | d_->Bool
 testdata/Builtins.lc 356:16-356:71  Type
 testdata/Builtins.lc 356:27-356:71  Type
 testdata/Builtins.lc 356:38-356:41  Nat -> Type->Type
 testdata/Builtins.lc 356:38-356:43  Type->Type
 testdata/Builtins.lc 356:38-356:45  Type
 testdata/Builtins.lc 356:38-356:71  Type
-testdata/Builtins.lc 356:42-356:43  V3
-testdata/Builtins.lc 356:44-356:45  V4
+testdata/Builtins.lc 356:42-356:43  d_
+testdata/Builtins.lc 356:44-356:45  e_
 testdata/Builtins.lc 356:49-356:52  Nat -> Type->Type
 testdata/Builtins.lc 356:49-356:54  Type->Type
 testdata/Builtins.lc 356:49-356:60  Type
 testdata/Builtins.lc 356:49-356:71  Type
-testdata/Builtins.lc 356:53-356:54  V2
+testdata/Builtins.lc 356:53-356:54  c_
 testdata/Builtins.lc 356:55-356:60  Type
 testdata/Builtins.lc 356:64-356:67  Nat -> Type->Type
 testdata/Builtins.lc 356:64-356:69  Type->Type
@@ -2365,15 +2365,15 @@ testdata/Builtins.lc 356:70-356:71  Type
 testdata/Builtins.lc 357:1-357:12  {a} -> {b:Nat} -> {c:Nat} -> Vec b a -> Vec c Swizz -> VecS a c
 testdata/Builtins.lc 357:19-357:29  {a} -> {b:Nat} -> Vec b a -> Bool
 testdata/Builtins.lc 357:19-357:31  Bool
-testdata/Builtins.lc 357:19-357:58  Vec V1 Swizz -> Vec V2 V4 | Vec V1 V2 -> Vec V1 Swizz -> Vec V2 V4 | VecS V4 V2
-testdata/Builtins.lc 357:30-357:31  Vec V5 V6
+testdata/Builtins.lc 357:19-357:58  Vec b_ Swizz -> Vec c_ e_ | Vec b_ c_ -> Vec b_ Swizz -> Vec c_ e_ | VecS e_ c_
+testdata/Builtins.lc 357:30-357:31  Vec f_ g_
 testdata/Builtins.lc 357:34-357:40  {a} -> {b} -> {c:Nat} -> a->b -> VecS a c -> VecS b c
-testdata/Builtins.lc 357:34-357:56  VecS Swizz V0 -> VecS V7 V1
-testdata/Builtins.lc 357:34-357:58  VecS V4 V2
+testdata/Builtins.lc 357:34-357:56  VecS Swizz a_ -> VecS h_ b_
+testdata/Builtins.lc 357:34-357:58  VecS e_ c_
 testdata/Builtins.lc 357:42-357:53  {a} -> {b:Nat} -> Vec b a -> Swizz->a
-testdata/Builtins.lc 357:42-357:55  Swizz->V9
-testdata/Builtins.lc 357:54-357:55  Vec V9 V10
-testdata/Builtins.lc 357:57-357:58  Vec V3 Swizz
+testdata/Builtins.lc 357:42-357:55  Swizz->j_
+testdata/Builtins.lc 357:54-357:55  Vec j_ k_
+testdata/Builtins.lc 357:57-357:58  Vec d_ Swizz
 testdata/Builtins.lc 361:6-361:20  Type
 testdata/Builtins.lc 361:6-376:23  Type
 testdata/Builtins.lc 362:7-362:13  BlendingFactor
@@ -2451,9 +2451,9 @@ testdata/Builtins.lc 432:6-433:22  Type
 testdata/Builtins.lc 432:6-434:23  Type
 testdata/Builtins.lc 432:6-434:36  Type
 testdata/Builtins.lc 432:16-432:17  Type
-testdata/Builtins.lc 433:7-433:16  PointSize V2 | Type | {a} -> Float -> PointSize a
+testdata/Builtins.lc 433:7-433:16  PointSize c_ | Type | {a} -> Float -> PointSize a
 testdata/Builtins.lc 433:17-433:22  Type
-testdata/Builtins.lc 434:7-434:23  PointSize V3 | Type | {a} -> a->Float -> PointSize a
+testdata/Builtins.lc 434:7-434:23  PointSize d_ | Type | {a} -> a->Float -> PointSize a
 testdata/Builtins.lc 434:25-434:26  Type
 testdata/Builtins.lc 434:30-434:35  Type
 testdata/Builtins.lc 436:6-436:17  Type | Type->Type
@@ -2462,12 +2462,12 @@ testdata/Builtins.lc 436:6-438:33  Type
 testdata/Builtins.lc 436:6-439:18  Type
 testdata/Builtins.lc 436:6-439:24  Type
 testdata/Builtins.lc 436:18-436:19  Type
-testdata/Builtins.lc 437:7-437:18  PolygonMode V1 | {a} -> PolygonMode a
-testdata/Builtins.lc 438:7-438:19  PolygonMode V3 | Type | {a} -> PointSize a -> PolygonMode a
+testdata/Builtins.lc 437:7-437:18  PolygonMode b_ | {a} -> PolygonMode a
+testdata/Builtins.lc 438:7-438:19  PolygonMode d_ | Type | {a} -> PointSize a -> PolygonMode a
 testdata/Builtins.lc 438:21-438:30  Type->Type
 testdata/Builtins.lc 438:21-438:32  Type
 testdata/Builtins.lc 438:31-438:32  Type
-testdata/Builtins.lc 439:7-439:18  PolygonMode V4 | Type | {a} -> Float -> PolygonMode a
+testdata/Builtins.lc 439:7-439:18  PolygonMode e_ | Type | {a} -> Float -> PolygonMode a
 testdata/Builtins.lc 439:19-439:24  Type
 testdata/Builtins.lc 441:6-441:19  Type
 testdata/Builtins.lc 441:6-443:13  Type
@@ -2486,23 +2486,23 @@ testdata/Builtins.lc 450:22-450:25  Nat -> Type->Type
 testdata/Builtins.lc 450:22-450:27  Type->Type
 testdata/Builtins.lc 450:22-450:33  Type
 testdata/Builtins.lc 450:22-450:48  Type
-testdata/Builtins.lc 450:26-450:27  V1
+testdata/Builtins.lc 450:26-450:27  b_
 testdata/Builtins.lc 450:28-450:33  Type
 testdata/Builtins.lc 450:37-450:40  Nat -> Type->Type
 testdata/Builtins.lc 450:37-450:42  Type->Type
 testdata/Builtins.lc 450:37-450:48  Type
-testdata/Builtins.lc 450:41-450:42  V1
+testdata/Builtins.lc 450:41-450:42  b_
 testdata/Builtins.lc 450:43-450:48  Type
 testdata/Builtins.lc 453:1-453:8  {a} -> String->a
 testdata/Builtins.lc 453:14-453:20  Type
 testdata/Builtins.lc 453:14-453:25  Type
-testdata/Builtins.lc 453:24-453:25  Type | V2
+testdata/Builtins.lc 453:24-453:25  Type | c_
 testdata/Builtins.lc 455:6-455:19  Type | Type -> PrimitiveType->Type
 testdata/Builtins.lc 455:6-458:111  Type
 testdata/Builtins.lc 455:25-455:38  Type
 testdata/Builtins.lc 455:25-455:46  Type
 testdata/Builtins.lc 455:42-455:46  Type
-testdata/Builtins.lc 456:3-456:14  RasterContext V5 'Triangle | {a} -> CullMode -> PolygonMode a -> PolygonOffset -> ProvokingVertex -> RasterContext a 'Triangle
+testdata/Builtins.lc 456:3-456:14  RasterContext f_ 'Triangle | {a} -> CullMode -> PolygonMode a -> PolygonOffset -> ProvokingVertex -> RasterContext a 'Triangle
 testdata/Builtins.lc 456:3-456:115  Type
 testdata/Builtins.lc 456:26-456:34  Type
 testdata/Builtins.lc 456:26-456:115  Type
@@ -2519,7 +2519,7 @@ testdata/Builtins.lc 456:91-456:106  PrimitiveType->Type
 testdata/Builtins.lc 456:91-456:115  Type
 testdata/Builtins.lc 456:105-456:106  Type
 testdata/Builtins.lc 456:107-456:115  PrimitiveType
-testdata/Builtins.lc 457:3-457:11  RasterContext V5 'Point | {a} -> PointSize a -> Float -> PointSpriteCoordOrigin -> RasterContext a 'Point
+testdata/Builtins.lc 457:3-457:11  RasterContext f_ 'Point | {a} -> PointSize a -> Float -> PointSpriteCoordOrigin -> RasterContext a 'Point
 testdata/Builtins.lc 457:3-457:112  Type
 testdata/Builtins.lc 457:26-457:35  Type->Type
 testdata/Builtins.lc 457:26-457:37  Type
@@ -2534,7 +2534,7 @@ testdata/Builtins.lc 457:91-457:106  PrimitiveType->Type
 testdata/Builtins.lc 457:91-457:112  Type
 testdata/Builtins.lc 457:105-457:106  Type
 testdata/Builtins.lc 457:107-457:112  PrimitiveType
-testdata/Builtins.lc 458:3-458:10  RasterContext V5 'Line | {a} -> Float -> ProvokingVertex -> RasterContext a 'Line
+testdata/Builtins.lc 458:3-458:10  RasterContext f_ 'Line | {a} -> Float -> ProvokingVertex -> RasterContext a 'Line
 testdata/Builtins.lc 458:3-458:111  Type
 testdata/Builtins.lc 458:26-458:31  Type
 testdata/Builtins.lc 458:26-458:111  Type
@@ -2549,17 +2549,17 @@ testdata/Builtins.lc 460:6-460:14  Type | Type->Type
 testdata/Builtins.lc 460:6-465:74  Type
 testdata/Builtins.lc 460:18-460:22  Type
 testdata/Builtins.lc 460:26-460:30  Type
-testdata/Builtins.lc 461:3-461:13  Blending V0 | {a} -> Blending a
+testdata/Builtins.lc 461:3-461:13  Blending a_ | {a} -> Blending a
 testdata/Builtins.lc 461:3-461:70  Type
 testdata/Builtins.lc 461:60-461:68  Type->Type
 testdata/Builtins.lc 461:60-461:70  Type
-testdata/Builtins.lc 461:69-461:70  Type | V1
-testdata/Builtins.lc 462:3-462:15  Blending V2 | {a} -> {_ : Integral a} -> LogicOperation -> Blending a
+testdata/Builtins.lc 461:69-461:70  Type | b_
+testdata/Builtins.lc 462:3-462:15  Blending c_ | {a} -> {_ : Integral a} -> LogicOperation -> Blending a
 testdata/Builtins.lc 462:3-462:70  Type
 testdata/Builtins.lc 462:26-462:70  Type
 testdata/Builtins.lc 462:27-462:35  Type->Type
 testdata/Builtins.lc 462:27-462:37  Type
-testdata/Builtins.lc 462:36-462:37  V1
+testdata/Builtins.lc 462:36-462:37  b_
 testdata/Builtins.lc 462:42-462:56  Type
 testdata/Builtins.lc 462:42-462:70  Type
 testdata/Builtins.lc 462:60-462:68  Type->Type
@@ -2586,7 +2586,7 @@ testdata/Builtins.lc 465:29-465:32  Nat -> Type->Type
 testdata/Builtins.lc 465:29-465:34  Type->Type
 testdata/Builtins.lc 465:29-465:40  Type
 testdata/Builtins.lc 465:29-465:74  Type
-testdata/Builtins.lc 465:33-465:34  V1
+testdata/Builtins.lc 465:33-465:34  b_
 testdata/Builtins.lc 465:35-465:40  Type
 testdata/Builtins.lc 465:60-465:68  Type->Type
 testdata/Builtins.lc 465:60-465:74  Type
@@ -2597,12 +2597,12 @@ testdata/Builtins.lc 470:6-470:23  ImageKind->Type | Type
 testdata/Builtins.lc 470:6-473:96  Type
 testdata/Builtins.lc 470:27-470:36  Type
 testdata/Builtins.lc 470:40-470:44  Type
-testdata/Builtins.lc 471:3-471:10  FragmentOperation ('Color (VecScalar V3 V4)) | {a} -> {b:Nat} -> {_ : Num a} -> Blending a -> VecScalar b Bool -> FragmentOperation ('Color (VecScalar b a))
+testdata/Builtins.lc 471:3-471:10  FragmentOperation ('Color (VecScalar d_ e_)) | {a} -> {b:Nat} -> {_ : Num a} -> Blending a -> VecScalar b Bool -> FragmentOperation ('Color (VecScalar b a))
 testdata/Builtins.lc 471:3-471:112  Type
 testdata/Builtins.lc 471:26-471:29  Type->Type
 testdata/Builtins.lc 471:26-471:31  Type
 testdata/Builtins.lc 471:26-471:112  Type
-testdata/Builtins.lc 471:30-471:31  V3
+testdata/Builtins.lc 471:30-471:31  d_
 testdata/Builtins.lc 471:35-471:43  Type->Type
 testdata/Builtins.lc 471:35-471:45  Type
 testdata/Builtins.lc 471:35-471:112  Type
@@ -2611,7 +2611,7 @@ testdata/Builtins.lc 471:49-471:58  Nat -> Type->Type
 testdata/Builtins.lc 471:49-471:60  Type->Type
 testdata/Builtins.lc 471:49-471:65  Type
 testdata/Builtins.lc 471:49-471:112  Type
-testdata/Builtins.lc 471:59-471:60  V3
+testdata/Builtins.lc 471:59-471:60  d_
 testdata/Builtins.lc 471:61-471:65  Type
 testdata/Builtins.lc 471:71-471:88  ImageKind->Type
 testdata/Builtins.lc 471:71-471:112  Type
@@ -2642,8 +2642,8 @@ testdata/Builtins.lc 473:71-473:96  Type
 testdata/Builtins.lc 473:89-473:96  ImageKind
 testdata/Builtins.lc 475:6-475:18  Type | Type->Type
 testdata/Builtins.lc 475:6-478:7  Type
-testdata/Builtins.lc 476:3-476:9  Interpolated V2 | Type | {a} -> {_ : Floating a} -> Interpolated a
-testdata/Builtins.lc 476:11-476:24  Interpolated V3 | Type | {a} -> {_ : Floating a} -> Interpolated a
+testdata/Builtins.lc 476:3-476:9  Interpolated c_ | Type | {a} -> {_ : Floating a} -> Interpolated a
+testdata/Builtins.lc 476:11-476:24  Interpolated d_ | Type | {a} -> {_ : Floating a} -> Interpolated a
 testdata/Builtins.lc 477:26-477:56  Type
 testdata/Builtins.lc 477:27-477:35  Type->Type
 testdata/Builtins.lc 477:27-477:37  Type
@@ -2651,7 +2651,7 @@ testdata/Builtins.lc 477:36-477:37  Type
 testdata/Builtins.lc 477:42-477:54  Type->Type
 testdata/Builtins.lc 477:42-477:56  Type
 testdata/Builtins.lc 477:55-477:56  Type
-testdata/Builtins.lc 478:3-478:7  Interpolated V3 | {a} -> Interpolated a
+testdata/Builtins.lc 478:3-478:7  Interpolated d_ | {a} -> Interpolated a
 testdata/Builtins.lc 478:42-478:54  Type->Type
 testdata/Builtins.lc 478:42-478:56  Type
 testdata/Builtins.lc 478:55-478:56  Type
@@ -2663,11 +2663,11 @@ testdata/Builtins.lc 481:10-481:28  List Type
 testdata/Builtins.lc 481:10-481:30  List Type -> Type
 testdata/Builtins.lc 481:10-481:44  Type
 testdata/Builtins.lc 481:14-481:26  Type->Type
-testdata/Builtins.lc 481:27-481:28  V7
+testdata/Builtins.lc 481:27-481:28  h_
 testdata/Builtins.lc 481:29-481:30  {a} -> a -> a->Type
-testdata/Builtins.lc 481:31-481:44  V5
-testdata/Builtins.lc 482:10-482:11  V5
-testdata/Builtins.lc 482:10-482:13  V4->Type
+testdata/Builtins.lc 481:31-481:44  f_
+testdata/Builtins.lc 482:10-482:11  f_
+testdata/Builtins.lc 482:10-482:13  e_->Type
 testdata/Builtins.lc 482:10-482:35  Type
 testdata/Builtins.lc 482:10-486:34  Type
 testdata/Builtins.lc 482:12-482:13  {a} -> a -> a->Type
@@ -2677,7 +2677,7 @@ testdata/Builtins.lc 482:14-482:35  List Type
 testdata/Builtins.lc 482:21-482:24  Nat -> Type->Type
 testdata/Builtins.lc 482:21-482:26  Type->Type
 testdata/Builtins.lc 482:21-482:32  Type
-testdata/Builtins.lc 482:25-482:26  V1
+testdata/Builtins.lc 482:25-482:26  b_
 testdata/Builtins.lc 482:27-482:32  Type
 testdata/Builtins.lc 482:34-482:35  List Type
 testdata/Builtins.lc 483:8-483:13  List Type -> Type
@@ -2691,7 +2691,7 @@ testdata/Builtins.lc 484:8-486:34  Type
 testdata/Builtins.lc 484:23-484:28  List Type -> Type
 testdata/Builtins.lc 484:23-484:30  Type
 testdata/Builtins.lc 484:29-484:30  List Type
-testdata/Builtins.lc 484:32-484:33  V4
+testdata/Builtins.lc 484:32-484:33  e_
 testdata/Builtins.lc 485:8-485:17  Type -> PrimitiveType->Type
 testdata/Builtins.lc 485:8-485:27  PrimitiveType->Type
 testdata/Builtins.lc 485:8-485:29  Type
@@ -2703,50 +2703,50 @@ testdata/Builtins.lc 485:28-485:29  PrimitiveType
 testdata/Builtins.lc 486:8-486:22  Nat -> Type->Type
 testdata/Builtins.lc 486:8-486:24  Type->Type
 testdata/Builtins.lc 486:8-486:34  Type
-testdata/Builtins.lc 486:23-486:24  V1
+testdata/Builtins.lc 486:23-486:24  b_
 testdata/Builtins.lc 486:26-486:31  List Type -> Type
 testdata/Builtins.lc 486:26-486:33  Type
 testdata/Builtins.lc 486:32-486:33  List Type
 testdata/Builtins.lc 488:1-488:20  {a : List Type} -> {b:PrimitiveType} -> RasterContext (HList ('Cons (Vec 4 Float) a)) b -> HList ('map Type Type Interpolated a) -> List (Primitive (HList ('Cons (Vec 4 Float) a)) b) -> List (Vector 1 (Maybe (SimpleFragment (HList a))))
 testdata/Builtins.lc 488:32-488:38  {a} -> List (List a) -> List a
-testdata/Builtins.lc 488:32-488:74  List (Vector 1 (Maybe (SimpleFragment (HList V1))))
+testdata/Builtins.lc 488:32-488:74  List (Vector 1 (Maybe (SimpleFragment (HList b_))))
 testdata/Builtins.lc 488:40-488:43  {a} -> {b} -> a->b -> List a -> List b
-testdata/Builtins.lc 488:40-488:71  List (Primitive (HList ('Cons (Vec 4 Float) V1)) V0) -> List (List (Fragment 1 (HList V2)))
-testdata/Builtins.lc 488:40-488:73  List (List (Fragment 1 (HList V1)))
+testdata/Builtins.lc 488:40-488:71  List (Primitive (HList ('Cons (Vec 4 Float) b_)) a_) -> List (List (Fragment 1 (HList c_)))
+testdata/Builtins.lc 488:40-488:73  List (List (Fragment 1 (HList b_)))
 testdata/Builtins.lc 488:45-488:63  {a : List Type} -> {b : List Type} -> {c : List Type} -> {d:PrimitiveType} -> {_ : 'map Type Type Interpolated a ~ b} -> {_ : c ~ 'Cons (Vec 4 Float) a} -> HList b -> RasterContext (HList c) d -> Primitive (HList c) d -> FragmentStream 1 (HList a)
-testdata/Builtins.lc 488:45-488:66  RasterContext (HList ('Cons (Vec 4 Float) V1)) V0 -> Primitive (HList ('Cons (Vec 4 Float) V2)) V1 -> FragmentStream 1 (HList V3)
-testdata/Builtins.lc 488:45-488:70  Primitive (HList ('Cons (Vec 4 Float) V1)) V0 -> FragmentStream 1 (HList V2)
-testdata/Builtins.lc 488:64-488:66  V8
-testdata/Builtins.lc 488:67-488:70  V7
-testdata/Builtins.lc 488:72-488:73  V3
+testdata/Builtins.lc 488:45-488:66  RasterContext (HList ('Cons (Vec 4 Float) b_)) a_ -> Primitive (HList ('Cons (Vec 4 Float) c_)) b_ -> FragmentStream 1 (HList d_)
+testdata/Builtins.lc 488:45-488:70  Primitive (HList ('Cons (Vec 4 Float) b_)) a_ -> FragmentStream 1 (HList c_)
+testdata/Builtins.lc 488:64-488:66  i_
+testdata/Builtins.lc 488:67-488:70  h_
+testdata/Builtins.lc 488:72-488:73  d_
 testdata/Builtins.lc 490:26-490:29  Type
 testdata/Builtins.lc 490:36-490:43  Type->Nat
 testdata/Builtins.lc 490:58-490:59  ImageKind->Nat | Nat | Nat -> ImageKind->Nat | Type->Nat
 testdata/Builtins.lc 492:12-492:15  Type
 testdata/Builtins.lc 492:12-492:23  Type
-testdata/Builtins.lc 492:12-495:50  V0->V1 | {a} -> List a -> Type
-testdata/Builtins.lc 492:13-492:14  V1
+testdata/Builtins.lc 492:12-495:50  a_->b_ | {a} -> List a -> Type
+testdata/Builtins.lc 492:13-492:14  b_
 testdata/Builtins.lc 492:19-492:23  Type
 testdata/Builtins.lc 493:1-493:8  {a} -> List a -> Type
 testdata/Builtins.lc 493:14-493:19  Type
-testdata/Builtins.lc 493:14-495:50  List V0 -> Type | Type
+testdata/Builtins.lc 493:14-495:50  List a_ -> Type | Type
 testdata/Builtins.lc 494:15-494:20  Type
-testdata/Builtins.lc 494:15-495:50  List V1 -> Type | List V2 -> Type | Type | V0 -> List V1 -> Type
+testdata/Builtins.lc 494:15-495:50  List b_ -> Type | List c_ -> Type | Type | a_ -> List b_ -> Type
 testdata/Builtins.lc 495:22-495:25  Type -> Type->Type
 testdata/Builtins.lc 495:22-495:33  Type->Type
-testdata/Builtins.lc 495:22-495:50  List V1 -> Type | Type | V0 -> List V1 -> Type
-testdata/Builtins.lc 495:27-495:28  V6
-testdata/Builtins.lc 495:27-495:30  V5->Type
+testdata/Builtins.lc 495:22-495:50  List b_ -> Type | Type | a_ -> List b_ -> Type
+testdata/Builtins.lc 495:27-495:28  g_
+testdata/Builtins.lc 495:27-495:30  f_->Type
 testdata/Builtins.lc 495:27-495:32  Type
 testdata/Builtins.lc 495:29-495:30  {a} -> a -> a->Type
-testdata/Builtins.lc 495:31-495:32  V2
+testdata/Builtins.lc 495:31-495:32  c_
 testdata/Builtins.lc 495:35-495:42  {a} -> List a -> Type
 testdata/Builtins.lc 495:35-495:49  Type
-testdata/Builtins.lc 495:44-495:45  V6
-testdata/Builtins.lc 495:44-495:46  List V5 -> List V6
-testdata/Builtins.lc 495:44-495:48  List V4
+testdata/Builtins.lc 495:44-495:45  g_
+testdata/Builtins.lc 495:44-495:46  List f_ -> List g_
+testdata/Builtins.lc 495:44-495:48  List e_
 testdata/Builtins.lc 495:45-495:46  {a} -> a -> List a -> List a
-testdata/Builtins.lc 495:46-495:48  List V4
+testdata/Builtins.lc 495:46-495:48  List e_
 testdata/Builtins.lc 497:1-497:16  List Type -> Type
 testdata/Builtins.lc 497:21-497:28  {a} -> List a -> Type
 testdata/Builtins.lc 497:21-497:45  Type
@@ -2754,7 +2754,7 @@ testdata/Builtins.lc 497:30-497:33  {a} -> {b} -> a->b -> List a -> List b
 testdata/Builtins.lc 497:30-497:42  List Type -> List Nat
 testdata/Builtins.lc 497:30-497:44  List Nat
 testdata/Builtins.lc 497:34-497:42  Type->Nat
-testdata/Builtins.lc 497:43-497:44  V1
+testdata/Builtins.lc 497:43-497:44  b_
 testdata/Builtins.lc 509:6-509:17  Nat -> List ImageKind -> Type | Type
 testdata/Builtins.lc 509:6-509:46  Type
 testdata/Builtins.lc 509:24-509:27  Type
@@ -2768,12 +2768,12 @@ testdata/Builtins.lc 512:1-512:11  List ImageKind -> List Type
 testdata/Builtins.lc 512:25-512:28  {a} -> {b} -> a->b -> List a -> List b
 testdata/Builtins.lc 512:25-512:38  List ImageKind -> List Type
 testdata/Builtins.lc 512:25-512:40  List Type
-testdata/Builtins.lc 512:25-513:31  List ImageKind -> List Type | List Type | List Type -> ImageKind -> List Type | List V1 -> List Type | V0 -> List V1 -> List Type
+testdata/Builtins.lc 512:25-513:31  List ImageKind -> List Type | List Type | List Type -> ImageKind -> List Type | List b_ -> List Type | a_ -> List b_ -> List Type
 testdata/Builtins.lc 512:29-512:38  ImageKind->Type
-testdata/Builtins.lc 512:39-512:40  List V2
+testdata/Builtins.lc 512:39-512:40  List c_
 testdata/Builtins.lc 513:16-513:19  {a} -> {b} -> a->b -> List a -> List b
 testdata/Builtins.lc 513:16-513:29  List ImageKind -> List Type
-testdata/Builtins.lc 513:16-513:31  List Type | Type->V1
+testdata/Builtins.lc 513:16-513:31  List Type | Type->b_
 testdata/Builtins.lc 513:20-513:29  ImageKind->Type
 testdata/Builtins.lc 513:30-513:31  List ImageKind
 testdata/Builtins.lc 515:40-515:49  Type
@@ -2786,8 +2786,8 @@ testdata/Builtins.lc 517:39-517:45  Type
 testdata/Builtins.lc 517:39-517:174  Type
 testdata/Builtins.lc 517:40-517:44  Type
 testdata/Builtins.lc 517:49-517:174  Type
-testdata/Builtins.lc 517:50-517:51  V4
-testdata/Builtins.lc 517:50-517:53  V3->Type
+testdata/Builtins.lc 517:50-517:51  e_
+testdata/Builtins.lc 517:50-517:53  d_->Type
 testdata/Builtins.lc 517:50-517:81  Type
 testdata/Builtins.lc 517:52-517:53  {a} -> a -> a->Type
 testdata/Builtins.lc 517:54-517:57  {a} -> {b} -> a->b -> List a -> List b
@@ -2821,17 +2821,17 @@ testdata/Builtins.lc 517:159-517:174  Type
 testdata/Builtins.lc 517:171-517:172  Nat
 testdata/Builtins.lc 517:173-517:174  List ImageKind
 testdata/Builtins.lc 519:1-519:15  {a} -> {b} -> a -> b->(a, b)
-testdata/Builtins.lc 519:24-519:32  (V3, V1)
-testdata/Builtins.lc 519:25-519:28  V5
-testdata/Builtins.lc 519:30-519:31  ((V1)) | V4
+testdata/Builtins.lc 519:24-519:32  (d_, b_)
+testdata/Builtins.lc 519:25-519:28  f_
+testdata/Builtins.lc 519:30-519:31  ((b_)) | e_
 testdata/Builtins.lc 520:1-520:8  {a:Nat} -> {b : List Type} -> FrameBuffer a ('map Type ImageKind FragmentOperationKind b) -> (HList b, List (Fragment a (HList ('imageType' ('map Type ImageKind FragmentOperationKind b))))) -> FrameBuffer a ('map Type ImageKind FragmentOperationKind b)
 testdata/Builtins.lc 520:25-520:35  {a : List ImageKind} -> {b:Nat} -> {c : List Type} -> {_ : a ~ 'map Type ImageKind FragmentOperationKind c} -> HList c -> FragmentStream b (HList ('imageType' a)) -> FrameBuffer b a -> FrameBuffer b a
-testdata/Builtins.lc 520:25-520:39  FragmentStream V1 (HList ('imageType' ('map Type ImageKind FragmentOperationKind V0))) -> FrameBuffer V2 ('map Type ImageKind FragmentOperationKind V1) -> FrameBuffer V3 ('map Type ImageKind FragmentOperationKind V2)
-testdata/Builtins.lc 520:25-520:43  FrameBuffer V1 ('map Type ImageKind FragmentOperationKind V0) -> FrameBuffer V2 ('map Type ImageKind FragmentOperationKind V1)
-testdata/Builtins.lc 520:25-520:46  FrameBuffer V1 ('map Type ImageKind FragmentOperationKind V0) | HList V2 -> V2 | V2 -> HList V2 -> V2
-testdata/Builtins.lc 520:36-520:39  V12
-testdata/Builtins.lc 520:40-520:43  V7
-testdata/Builtins.lc 520:44-520:46  V13
+testdata/Builtins.lc 520:25-520:39  FragmentStream b_ (HList ('imageType' ('map Type ImageKind FragmentOperationKind a_))) -> FrameBuffer c_ ('map Type ImageKind FragmentOperationKind b_) -> FrameBuffer d_ ('map Type ImageKind FragmentOperationKind c_)
+testdata/Builtins.lc 520:25-520:43  FrameBuffer b_ ('map Type ImageKind FragmentOperationKind a_) -> FrameBuffer c_ ('map Type ImageKind FragmentOperationKind b_)
+testdata/Builtins.lc 520:25-520:46  FrameBuffer b_ ('map Type ImageKind FragmentOperationKind a_) | HList c_ -> c_ | c_ -> HList c_ -> c_
+testdata/Builtins.lc 520:36-520:39  m_
+testdata/Builtins.lc 520:40-520:43  h_
+testdata/Builtins.lc 520:44-520:46  n_
 testdata/Builtins.lc 524:31-524:40  Type
 testdata/Builtins.lc 524:47-524:59  Type->ImageKind
 testdata/Builtins.lc 524:74-524:75  ImageKind | ImageKind->ImageKind | Nat -> ImageKind->ImageKind | Type->ImageKind
@@ -2863,34 +2863,34 @@ testdata/Builtins.lc 532:1-532:11  {a : List Type} -> {_ : 'sameLayerCounts a} -
 testdata/Builtins.lc 532:14-532:25  {a : List Type} -> {_ : 'sameLayerCounts a} -> HList a -> FrameBuffer (ImageLC ('head Type a)) ('map Type ImageKind GetImageKind a)
 testdata/Builtins.lc 534:1-534:11  {a:Nat} -> {b : List Type} -> {c} -> HList b -> (c -> HList ('imageType' ('map Type ImageKind FragmentOperationKind b))) -> List (Vector a (Maybe (SimpleFragment c))) -> FrameBuffer a ('map Type ImageKind FragmentOperationKind b) -> FrameBuffer a ('map Type ImageKind FragmentOperationKind b)
 testdata/Builtins.lc 534:34-534:44  {a : List ImageKind} -> {b:Nat} -> {c : List Type} -> {_ : a ~ 'map Type ImageKind FragmentOperationKind c} -> HList c -> FragmentStream b (HList ('imageType' a)) -> FrameBuffer b a -> FrameBuffer b a
-testdata/Builtins.lc 534:34-534:48  FragmentStream V1 (HList ('imageType' ('map Type ImageKind FragmentOperationKind V0))) -> FrameBuffer V2 ('map Type ImageKind FragmentOperationKind V1) -> FrameBuffer V3 ('map Type ImageKind FragmentOperationKind V2)
-testdata/Builtins.lc 534:34-534:76  FrameBuffer V2 ('map Type ImageKind FragmentOperationKind V1) -> FrameBuffer V3 ('map Type ImageKind FragmentOperationKind V2)
-testdata/Builtins.lc 534:34-534:79  FrameBuffer V2 ('map Type ImageKind FragmentOperationKind V1)
-testdata/Builtins.lc 534:45-534:48  V9
+testdata/Builtins.lc 534:34-534:48  FragmentStream b_ (HList ('imageType' ('map Type ImageKind FragmentOperationKind a_))) -> FrameBuffer c_ ('map Type ImageKind FragmentOperationKind b_) -> FrameBuffer d_ ('map Type ImageKind FragmentOperationKind c_)
+testdata/Builtins.lc 534:34-534:76  FrameBuffer c_ ('map Type ImageKind FragmentOperationKind b_) -> FrameBuffer d_ ('map Type ImageKind FragmentOperationKind c_)
+testdata/Builtins.lc 534:34-534:79  FrameBuffer c_ ('map Type ImageKind FragmentOperationKind b_)
+testdata/Builtins.lc 534:45-534:48  j_
 testdata/Builtins.lc 534:50-534:62  {a} -> {b} -> {c:Nat} -> a->b -> List (Vector c (Maybe (SimpleFragment a))) -> List (Vector c (Maybe (SimpleFragment b)))
-testdata/Builtins.lc 534:50-534:70  List (Vector V0 (Maybe (SimpleFragment V2))) -> List (Vector V1 (Maybe (SimpleFragment V2)))
-testdata/Builtins.lc 534:50-534:75  List (Vector V2 (Maybe (SimpleFragment (HList ('imageType' ('map Type ImageKind FragmentOperationKind V1))))))
-testdata/Builtins.lc 534:63-534:70  V10
-testdata/Builtins.lc 534:71-534:75  V6
-testdata/Builtins.lc 534:77-534:79  V4
+testdata/Builtins.lc 534:50-534:70  List (Vector a_ (Maybe (SimpleFragment c_))) -> List (Vector b_ (Maybe (SimpleFragment c_)))
+testdata/Builtins.lc 534:50-534:75  List (Vector c_ (Maybe (SimpleFragment (HList ('imageType' ('map Type ImageKind FragmentOperationKind b_))))))
+testdata/Builtins.lc 534:63-534:70  k_
+testdata/Builtins.lc 534:71-534:75  g_
+testdata/Builtins.lc 534:77-534:79  e_
 testdata/Builtins.lc 537:1-537:9  {a:ImageKind} -> FrameBuffer 1 ('Cons a 'Nil) -> Image 1 a
 testdata/Builtins.lc 537:24-537:35  Nat -> List ImageKind -> Type
 testdata/Builtins.lc 537:24-537:37  List ImageKind -> Type
 testdata/Builtins.lc 537:24-537:42  Type
 testdata/Builtins.lc 537:24-537:55  Type
-testdata/Builtins.lc 537:36-537:37  V1
+testdata/Builtins.lc 537:36-537:37  b_
 testdata/Builtins.lc 537:38-537:42  List ImageKind
-testdata/Builtins.lc 537:40-537:41  V2
+testdata/Builtins.lc 537:40-537:41  c_
 testdata/Builtins.lc 537:46-537:51  Nat -> ImageKind->Type
 testdata/Builtins.lc 537:46-537:53  ImageKind->Type
 testdata/Builtins.lc 537:46-537:55  Type
-testdata/Builtins.lc 537:52-537:53  V1
+testdata/Builtins.lc 537:52-537:53  b_
 testdata/Builtins.lc 537:54-537:55  ImageKind
 testdata/Builtins.lc 538:1-538:14  FrameBuffer 1 ('Cons 'Depth ('Cons ('Color (Vec 4 Float)) 'Nil)) -> Image 1 ('Color (Vec 4 Float))
 testdata/Builtins.lc 538:24-538:35  Nat -> List ImageKind -> Type
 testdata/Builtins.lc 538:24-538:37  List ImageKind -> Type
 testdata/Builtins.lc 538:24-538:70  Type
-testdata/Builtins.lc 538:36-538:37  V1
+testdata/Builtins.lc 538:36-538:37  b_
 testdata/Builtins.lc 538:38-538:70  List ImageKind
 testdata/Builtins.lc 538:41-538:47  ImageKind
 testdata/Builtins.lc 538:49-538:55  Type->ImageKind
@@ -2898,18 +2898,18 @@ testdata/Builtins.lc 538:49-538:69  ImageKind | List ImageKind
 testdata/Builtins.lc 538:57-538:60  Nat -> Type->Type
 testdata/Builtins.lc 538:57-538:62  Type->Type
 testdata/Builtins.lc 538:57-538:68  Type
-testdata/Builtins.lc 538:61-538:62  V1
+testdata/Builtins.lc 538:61-538:62  b_
 testdata/Builtins.lc 538:63-538:68  Type
 testdata/Builtins.lc 538:74-538:79  Nat -> ImageKind->Type
 testdata/Builtins.lc 538:74-538:81  ImageKind->Type
 testdata/Builtins.lc 538:74-538:103  Type
-testdata/Builtins.lc 538:80-538:81  V1
+testdata/Builtins.lc 538:80-538:81  b_
 testdata/Builtins.lc 538:83-538:88  Type->ImageKind
 testdata/Builtins.lc 538:83-538:102  ImageKind
 testdata/Builtins.lc 538:90-538:93  Nat -> Type->Type
 testdata/Builtins.lc 538:90-538:95  Type->Type
 testdata/Builtins.lc 538:90-538:101  Type
-testdata/Builtins.lc 538:94-538:95  V1
+testdata/Builtins.lc 538:94-538:95  b_
 testdata/Builtins.lc 538:96-538:101  Type
 testdata/Builtins.lc 540:6-540:12  Type
 testdata/Builtins.lc 540:6-541:12  Type
@@ -2918,8 +2918,8 @@ testdata/Builtins.lc 541:26-541:37  Nat -> List ImageKind -> Type
 testdata/Builtins.lc 541:26-541:39  List ImageKind -> Type
 testdata/Builtins.lc 541:26-541:41  Type
 testdata/Builtins.lc 541:26-541:51  Type
-testdata/Builtins.lc 541:38-541:39  V3
-testdata/Builtins.lc 541:40-541:41  V1
+testdata/Builtins.lc 541:38-541:39  d_
+testdata/Builtins.lc 541:40-541:41  b_
 testdata/Builtins.lc 541:45-541:51  Type
 testdata/Builtins.lc 543:1-543:12  {a:Nat} -> {b : List ImageKind} -> FrameBuffer a b -> Output
 testdata/Builtins.lc 543:15-543:24  {a:Nat} -> {b : List ImageKind} -> FrameBuffer a b -> Output
@@ -2932,19 +2932,19 @@ testdata/Builtins.lc 553:3-553:12  Texture | Type | Vec 2 Int -> Image 1 ('Color
 testdata/Builtins.lc 553:20-553:23  Nat -> Type->Type
 testdata/Builtins.lc 553:20-553:25  Type->Type
 testdata/Builtins.lc 553:20-553:29  Type
-testdata/Builtins.lc 553:24-553:25  V1
+testdata/Builtins.lc 553:24-553:25  b_
 testdata/Builtins.lc 553:26-553:29  Type
 testdata/Builtins.lc 554:20-554:25  Nat -> ImageKind->Type
 testdata/Builtins.lc 554:20-554:27  ImageKind->Type
 testdata/Builtins.lc 554:20-554:49  Type
 testdata/Builtins.lc 554:20-555:27  Type
-testdata/Builtins.lc 554:26-554:27  V1
+testdata/Builtins.lc 554:26-554:27  b_
 testdata/Builtins.lc 554:29-554:34  Type->ImageKind
 testdata/Builtins.lc 554:29-554:48  ImageKind
 testdata/Builtins.lc 554:36-554:39  Nat -> Type->Type
 testdata/Builtins.lc 554:36-554:41  Type->Type
 testdata/Builtins.lc 554:36-554:47  Type
-testdata/Builtins.lc 554:40-554:41  V1
+testdata/Builtins.lc 554:40-554:41  b_
 testdata/Builtins.lc 554:42-554:47  Type
 testdata/Builtins.lc 555:20-555:27  Type
 testdata/Builtins.lc 557:6-557:12  Type
@@ -2969,15 +2969,15 @@ testdata/Builtins.lc 569:25-569:28  Nat -> Type->Type
 testdata/Builtins.lc 569:25-569:30  Type->Type
 testdata/Builtins.lc 569:25-569:36  Type
 testdata/Builtins.lc 569:25-569:51  Type
-testdata/Builtins.lc 569:29-569:30  V1
+testdata/Builtins.lc 569:29-569:30  b_
 testdata/Builtins.lc 569:31-569:36  Type
 testdata/Builtins.lc 569:40-569:43  Nat -> Type->Type
 testdata/Builtins.lc 569:40-569:45  Type->Type
 testdata/Builtins.lc 569:40-569:51  Type
-testdata/Builtins.lc 569:44-569:45  V1
+testdata/Builtins.lc 569:44-569:45  b_
 testdata/Builtins.lc 569:46-569:51  Type
 testdata/Builtins.lc 573:1-573:20  {a} -> a->a
-testdata/Builtins.lc 573:25-573:26  V1
+testdata/Builtins.lc 573:25-573:26  b_
 ------------ warnings
 Uncovered pattern(s) at testdata/Builtins.lc:201:1:
 head (x: _) = x
@@ -3004,5 +3004,5 @@ Uncovered pattern(s) at testdata/Builtins.lc:357:1:
 swizzvector v w | definedVec v = mapVec (swizzscalar v) w
 ^^^^^^^^^^^
 Missing case(s):
-  _ _ | False <- definedVec V1
+  _ _ | False <- definedVec b_
 
diff --git a/testdata/Internals.out b/testdata/Internals.out
index 9d830464..dca27f59 100644
--- a/testdata/Internals.out
+++ b/testdata/Internals.out
@@ -87,9 +87,9 @@ hlistNilCase :: a:Type -> a -> ()->a
 hlistConsCase :: {a} -> {b : 'List Type} -> c:Type -> (a -> 'HList b -> c) -> 'HList (Cons a b) -> c
 ------------ tooltips
 testdata/Internals.lc 6:1-6:8  {a} -> a->a
-testdata/Internals.lc 6:13-6:14  V1
+testdata/Internals.lc 6:13-6:14  b_
 testdata/Internals.lc 9:1-9:7  {a} -> a->a
-testdata/Internals.lc 9:12-9:13  V1
+testdata/Internals.lc 9:12-9:13  b_
 testdata/Internals.lc 11:1-11:10  {a}->a
 testdata/Internals.lc 11:27-11:31  Type
 testdata/Internals.lc 11:35-11:36  Type
@@ -106,16 +106,16 @@ testdata/Internals.lc 16:6-16:12  Type
 testdata/Internals.lc 17:6-17:11  String->Type | Type
 testdata/Internals.lc 17:18-17:24  Type
 testdata/Internals.lc 19:1-19:13  {a} -> {b} -> a->b
-testdata/Internals.lc 19:30-19:31  V3
+testdata/Internals.lc 19:30-19:31  d_
 testdata/Internals.lc 19:30-19:36  Type
-testdata/Internals.lc 19:35-19:36  Type | V2
+testdata/Internals.lc 19:35-19:36  Type | c_
 testdata/Internals.lc 22:13-22:17  a:Type -> a -> a->Type
 testdata/Internals.lc 22:24-22:28  Type
 testdata/Internals.lc 22:36-22:37  Type
 testdata/Internals.lc 22:36-22:46  Type
 testdata/Internals.lc 22:45-22:46  Type
 testdata/Internals.lc 31:1-31:8  a:Type -> a -> a->a
-testdata/Internals.lc 31:24-31:25  V1
+testdata/Internals.lc 31:24-31:25  b_
 testdata/Internals.lc 31:24-31:35  Type
 testdata/Internals.lc 31:29-31:30  Type
 testdata/Internals.lc 31:29-31:35  Type
@@ -139,7 +139,7 @@ testdata/Internals.lc 36:84-36:87  Type
 testdata/Internals.lc 36:86-36:87  Type
 testdata/Internals.lc 38:6-38:11  {a} -> a -> a->Type
 testdata/Internals.lc 38:14-38:18  a:Type -> a -> a->Type
-testdata/Internals.lc 38:14-38:20  V0 -> V1->Type
+testdata/Internals.lc 38:14-38:20  a_ -> b_->Type
 testdata/Internals.lc 41:1-41:4  Unit -> Unit->Unit
 testdata/Internals.lc 41:8-41:12  Type
 testdata/Internals.lc 41:16-41:20  Type
@@ -229,15 +229,15 @@ testdata/Internals.lc 71:24-71:29  Type
 testdata/Internals.lc 71:33-71:36  Type
 testdata/Internals.lc 74:19-74:23  Type
 testdata/Internals.lc 74:19-74:38  Type
-testdata/Internals.lc 74:27-74:28  V2
+testdata/Internals.lc 74:27-74:28  c_
 testdata/Internals.lc 74:27-74:38  Type
 testdata/Internals.lc 74:32-74:33  Type
 testdata/Internals.lc 74:32-74:38  Type
 testdata/Internals.lc 74:37-74:38  Type
 testdata/Internals.lc 75:1-75:15  {a} -> Bool -> a -> a->a
-testdata/Internals.lc 75:28-75:29  V3
-testdata/Internals.lc 75:28-76:29  Bool -> V1 -> V2->V3 | Bool->V4 | V1 -> V2->V3 | V2->V3 | V3
-testdata/Internals.lc 76:28-76:29  V4
+testdata/Internals.lc 75:28-75:29  d_
+testdata/Internals.lc 75:28-76:29  Bool -> b_ -> c_->d_ | Bool->e_ | b_ -> c_->d_ | c_->d_ | d_
+testdata/Internals.lc 76:28-76:29  e_
 testdata/Internals.lc 78:1-78:5  Ordering->Bool
 testdata/Internals.lc 78:11-78:15  Bool
 testdata/Internals.lc 78:11-79:15  Bool -> Ordering->Bool
@@ -260,30 +260,30 @@ testdata/Internals.lc 85:3-85:9  {a} -> {_ : Num a} -> a->a
 testdata/Internals.lc 85:13-85:14  Type
 testdata/Internals.lc 85:13-85:19  Type
 testdata/Internals.lc 85:18-85:19  Type
-testdata/Internals.lc 88:13-100:25  Int->V2 | {_ : Num V0} -> Int->V2 | {a} -> {_ : Num a} -> Int->a
-testdata/Internals.lc 88:19-88:20  V1
+testdata/Internals.lc 88:13-100:25  Int->c_ | {_ : Num a_} -> Int->c_ | {a} -> {_ : Num a} -> Int->a
+testdata/Internals.lc 88:19-88:20  b_
 testdata/Internals.lc 89:13-89:27  Int -> Int->Ordering
-testdata/Internals.lc 89:13-101:22  V1 -> V2->Ordering | {_ : Num V0} -> V1 -> V2->Ordering | {a} -> {_ : Num a} -> a -> a->Ordering
+testdata/Internals.lc 89:13-101:22  b_ -> c_->Ordering | {_ : Num a_} -> b_ -> c_->Ordering | {a} -> {_ : Num a} -> a -> a->Ordering
 testdata/Internals.lc 90:13-90:26  Int->Int
-testdata/Internals.lc 90:13-102:22  V1->V2 | {_ : Num V0} -> V1->V2 | {a} -> {_ : Num a} -> a->a
+testdata/Internals.lc 90:13-102:22  b_->c_ | {_ : Num a_} -> b_->c_ | {a} -> {_ : Num a} -> a->a
 testdata/Internals.lc 92:13-92:26  Int->Word
-testdata/Internals.lc 92:13-100:25  Int->V2
+testdata/Internals.lc 92:13-100:25  Int->c_
 testdata/Internals.lc 93:13-93:28  Word -> Word->Ordering
-testdata/Internals.lc 93:13-101:22  V1 -> V2->Ordering
+testdata/Internals.lc 93:13-101:22  b_ -> c_->Ordering
 testdata/Internals.lc 94:13-94:27  Word->Word
-testdata/Internals.lc 94:13-102:22  V1->V2
+testdata/Internals.lc 94:13-102:22  b_->c_
 testdata/Internals.lc 96:13-96:27  Int->Float
-testdata/Internals.lc 96:13-100:25  Int->V2
+testdata/Internals.lc 96:13-100:25  Int->c_
 testdata/Internals.lc 97:13-97:29  Float -> Float->Ordering
-testdata/Internals.lc 97:13-101:22  V1 -> V2->Ordering
+testdata/Internals.lc 97:13-101:22  b_ -> c_->Ordering
 testdata/Internals.lc 98:13-98:28  Float->Float
-testdata/Internals.lc 98:13-102:22  V1->V2
+testdata/Internals.lc 98:13-102:22  b_->c_
 testdata/Internals.lc 100:13-100:25  Int->Nat
 testdata/Internals.lc 101:13-101:22  {a}->a
 testdata/Internals.lc 102:13-102:22  {a}->a
 testdata/Internals.lc 104:7-104:9  Type->Type
 testdata/Internals.lc 104:7-105:27  Type
-testdata/Internals.lc 104:7-120:29  V0->V1 | {a} -> {_ : Eq a} -> a -> a->Bool
+testdata/Internals.lc 104:7-120:29  a_->b_ | {a} -> {_ : Eq a} -> a -> a->Bool
 testdata/Internals.lc 105:6-105:8  {a} -> {_ : Eq a} -> a -> a->Bool
 testdata/Internals.lc 105:13-105:14  Type
 testdata/Internals.lc 105:13-105:27  Type
@@ -292,39 +292,39 @@ testdata/Internals.lc 105:18-105:27  Type
 testdata/Internals.lc 105:23-105:27  Type
 testdata/Internals.lc 109:35-109:39  Ordering->Bool
 testdata/Internals.lc 109:35-109:63  Bool
-testdata/Internals.lc 109:35-120:29  V1 -> V2->Bool | {_ : Eq V0} -> V1 -> V2->Bool | {a} -> {_ : Eq a} -> a -> a->Bool
+testdata/Internals.lc 109:35-120:29  b_ -> c_->Bool | {_ : Eq a_} -> b_ -> c_->Bool | {a} -> {_ : Eq a} -> a -> a->Bool
 testdata/Internals.lc 109:41-109:58  String -> String->Ordering
 testdata/Internals.lc 109:41-109:60  String->Ordering
 testdata/Internals.lc 109:41-109:62  Ordering
-testdata/Internals.lc 109:59-109:60  V3
-testdata/Internals.lc 109:61-109:62  V1
+testdata/Internals.lc 109:59-109:60  d_
+testdata/Internals.lc 109:61-109:62  b_
 testdata/Internals.lc 110:33-110:37  Ordering->Bool
 testdata/Internals.lc 110:33-110:59  Bool
-testdata/Internals.lc 110:33-120:29  V1 -> V2->Bool
+testdata/Internals.lc 110:33-120:29  b_ -> c_->Bool
 testdata/Internals.lc 110:39-110:54  Char -> Char->Ordering
 testdata/Internals.lc 110:39-110:56  Char->Ordering
 testdata/Internals.lc 110:39-110:58  Ordering
-testdata/Internals.lc 110:55-110:56  V3
-testdata/Internals.lc 110:57-110:58  V1
+testdata/Internals.lc 110:55-110:56  d_
+testdata/Internals.lc 110:57-110:58  b_
 testdata/Internals.lc 111:32-111:36  Ordering->Bool
 testdata/Internals.lc 111:32-111:57  Bool
-testdata/Internals.lc 111:32-120:29  V1 -> V2->Bool
+testdata/Internals.lc 111:32-120:29  b_ -> c_->Bool
 testdata/Internals.lc 111:38-111:52  Int -> Int->Ordering
 testdata/Internals.lc 111:38-111:54  Int->Ordering
 testdata/Internals.lc 111:38-111:56  Ordering
-testdata/Internals.lc 111:53-111:54  V3
-testdata/Internals.lc 111:55-111:56  V1
+testdata/Internals.lc 111:53-111:54  d_
+testdata/Internals.lc 111:55-111:56  b_
 testdata/Internals.lc 112:34-112:38  Ordering->Bool
 testdata/Internals.lc 112:34-112:61  Bool
-testdata/Internals.lc 112:34-120:29  V1 -> V2->Bool
+testdata/Internals.lc 112:34-120:29  b_ -> c_->Bool
 testdata/Internals.lc 112:40-112:56  Float -> Float->Ordering
 testdata/Internals.lc 112:40-112:58  Float->Ordering
 testdata/Internals.lc 112:40-112:60  Ordering
-testdata/Internals.lc 112:57-112:58  V3
-testdata/Internals.lc 112:59-112:60  V1
+testdata/Internals.lc 112:57-112:58  d_
+testdata/Internals.lc 112:59-112:60  b_
 testdata/Internals.lc 114:20-114:24  Bool
 testdata/Internals.lc 114:20-116:19  Bool | Bool->Bool
-testdata/Internals.lc 114:20-120:29  V1 -> V2->Bool
+testdata/Internals.lc 114:20-120:29  b_ -> c_->Bool
 testdata/Internals.lc 115:22-115:26  Bool
 testdata/Internals.lc 115:22-116:19  Bool | Bool->Bool
 testdata/Internals.lc 116:14-116:19  Bool
@@ -342,8 +342,8 @@ testdata/Internals.lc 122:6-122:12  Type
 testdata/Internals.lc 122:6-122:25  Type
 testdata/Internals.lc 122:6-122:36  Type
 testdata/Internals.lc 122:11-122:12  Type
-testdata/Internals.lc 122:15-122:18  List V1 | {a} -> List a
-testdata/Internals.lc 122:21-122:25  List V4 | Type | {a} -> a -> List a -> List a
+testdata/Internals.lc 122:15-122:18  List b_ | {a} -> List a
+testdata/Internals.lc 122:21-122:25  List e_ | Type | {a} -> a -> List a -> List a
 testdata/Internals.lc 122:26-122:27  Type
 testdata/Internals.lc 122:29-122:33  Type->Type
 testdata/Internals.lc 122:29-122:35  Type
@@ -358,14 +358,14 @@ testdata/Internals.lc 127:5-127:22  Type
 testdata/Internals.lc 127:13-127:18  List Type -> Type
 testdata/Internals.lc 127:13-127:22  Type
 testdata/Internals.lc 127:19-127:22  {a} -> List a
-testdata/Internals.lc 128:5-128:10  HList ('Cons V3 V2) | {a} -> {b : List Type} -> a -> HList b -> HList ('Cons a b)
+testdata/Internals.lc 128:5-128:10  HList ('Cons d_ c_) | {a} -> {b : List Type} -> a -> HList b -> HList ('Cons a b)
 testdata/Internals.lc 128:5-128:45  Type
-testdata/Internals.lc 128:14-128:15  V3
+testdata/Internals.lc 128:14-128:15  d_
 testdata/Internals.lc 128:14-128:45  Type
 testdata/Internals.lc 128:19-128:24  List Type -> Type
 testdata/Internals.lc 128:19-128:27  Type
 testdata/Internals.lc 128:19-128:45  Type
-testdata/Internals.lc 128:25-128:27  V2
+testdata/Internals.lc 128:25-128:27  c_
 testdata/Internals.lc 128:31-128:36  List Type -> Type
 testdata/Internals.lc 128:31-128:45  Type
 testdata/Internals.lc 128:39-128:40  Type
@@ -374,7 +374,7 @@ testdata/Internals.lc 128:39-128:44  List Type
 testdata/Internals.lc 128:40-128:41  {a} -> a -> List a -> List a
 testdata/Internals.lc 128:42-128:44  List Type
 testdata/Internals.lc 130:1-130:13  a:Type -> a -> ()->a
-testdata/Internals.lc 130:29-130:30  V1
+testdata/Internals.lc 130:29-130:30  b_
 testdata/Internals.lc 130:29-130:48  Type
 testdata/Internals.lc 130:34-130:39  List Type -> Type
 testdata/Internals.lc 130:34-130:43  Type
@@ -394,7 +394,7 @@ testdata/Internals.lc 134:14-134:19  List Type -> Type
 testdata/Internals.lc 134:14-134:21  Type
 testdata/Internals.lc 134:14-134:26  Type
 testdata/Internals.lc 134:20-134:21  List Type
-testdata/Internals.lc 134:25-134:26  Type | V3
+testdata/Internals.lc 134:25-134:26  Type | d_
 testdata/Internals.lc 135:8-135:13  List Type -> Type
 testdata/Internals.lc 135:8-135:24  Type
 testdata/Internals.lc 135:8-136:9  Type
diff --git a/testdata/Material.out b/testdata/Material.out
index 88b4f832..487f201b 100644
--- a/testdata/Material.out
+++ b/testdata/Material.out
@@ -159,7 +159,7 @@ defaultCommonAttrs :: 'CommonAttrs
 ------------ tooltips
 testdata/Material.lc 7:18-7:23  Type
 testdata/Material.lc 8:1-8:14  Float
-testdata/Material.lc 8:17-8:18  V1
+testdata/Material.lc 8:17-8:18  b_
 testdata/Material.lc 10:6-10:12  Type
 testdata/Material.lc 10:6-11:13  Type
 testdata/Material.lc 10:6-15:39  Type
@@ -168,25 +168,25 @@ testdata/Material.lc 12:7-12:20  Entity -> VecS Float 4
 testdata/Material.lc 12:28-12:31  Nat -> Type->Type
 testdata/Material.lc 12:28-12:33  Type->Type
 testdata/Material.lc 12:28-12:39  Type
-testdata/Material.lc 12:32-12:33  V1
+testdata/Material.lc 12:32-12:33  b_
 testdata/Material.lc 12:34-12:39  Type
 testdata/Material.lc 13:7-13:21  Entity -> VecS Float 4
 testdata/Material.lc 13:28-13:31  Nat -> Type->Type
 testdata/Material.lc 13:28-13:33  Type->Type
 testdata/Material.lc 13:28-13:39  Type
-testdata/Material.lc 13:32-13:33  V1
+testdata/Material.lc 13:32-13:33  b_
 testdata/Material.lc 13:34-13:39  Type
 testdata/Material.lc 14:7-14:16  Entity -> VecS Float 3
 testdata/Material.lc 14:28-14:31  Nat -> Type->Type
 testdata/Material.lc 14:28-14:33  Type->Type
 testdata/Material.lc 14:28-14:39  Type
-testdata/Material.lc 14:32-14:33  V1
+testdata/Material.lc 14:32-14:33  b_
 testdata/Material.lc 14:34-14:39  Type
 testdata/Material.lc 15:7-15:18  Entity -> VecS Float 4
 testdata/Material.lc 15:28-15:31  Nat -> Type->Type
 testdata/Material.lc 15:28-15:33  Type->Type
 testdata/Material.lc 15:28-15:39  Type
-testdata/Material.lc 15:32-15:33  V1
+testdata/Material.lc 15:32-15:33  b_
 testdata/Material.lc 15:34-15:39  Type
 testdata/Material.lc 18:6-18:14  Type
 testdata/Material.lc 18:6-24:15  Type
@@ -221,7 +221,7 @@ testdata/Material.lc 33:7-33:13  Deform | Type | Vec 3 Float -> Wave->Deform
 testdata/Material.lc 33:15-33:18  Nat -> Type->Type
 testdata/Material.lc 33:15-33:20  Type->Type
 testdata/Material.lc 33:15-33:26  Type
-testdata/Material.lc 33:19-33:20  V1
+testdata/Material.lc 33:19-33:20  b_
 testdata/Material.lc 33:21-33:26  Type
 testdata/Material.lc 33:28-33:32  Type
 testdata/Material.lc 34:7-34:15  Deform | Float -> Float->Deform | Type
@@ -298,12 +298,12 @@ testdata/Material.lc 97:7-97:16  TCGen | Type | Vec 3 Float -> Vec 3 Float -> TC
 testdata/Material.lc 97:18-97:21  Nat -> Type->Type
 testdata/Material.lc 97:18-97:23  Type->Type
 testdata/Material.lc 97:18-97:29  Type
-testdata/Material.lc 97:22-97:23  V1
+testdata/Material.lc 97:22-97:23  b_
 testdata/Material.lc 97:24-97:29  Type
 testdata/Material.lc 97:32-97:35  Nat -> Type->Type
 testdata/Material.lc 97:32-97:37  Type->Type
 testdata/Material.lc 97:32-97:43  Type
-testdata/Material.lc 97:36-97:37  V1
+testdata/Material.lc 97:36-97:37  b_
 testdata/Material.lc 97:38-97:43  Type
 testdata/Material.lc 98:7-98:19  TCGen
 testdata/Material.lc 101:6-101:11  Type
@@ -464,7 +464,7 @@ testdata/Material.lc 183:22-196:6  CommonAttrs
 testdata/Material.lc 184:27-184:29  ()
 testdata/Material.lc 185:27-185:29  ()
 testdata/Material.lc 186:27-186:32  Bool
-testdata/Material.lc 187:27-187:28  V1
+testdata/Material.lc 187:27-187:28  b_
 testdata/Material.lc 188:27-188:32  Bool
 testdata/Material.lc 189:27-189:32  Bool
 testdata/Material.lc 190:27-190:40  CullType
diff --git a/testdata/Prelude.out b/testdata/Prelude.out
index 4b01cfa4..ee451b4f 100644
--- a/testdata/Prelude.out
+++ b/testdata/Prelude.out
@@ -173,40 +173,40 @@ fromTo :: 'Float -> 'Float -> 'List 'Float
 !! :: {a} -> 'List a -> 'Int->a
 ------------ tooltips
 testdata/Prelude.lc 16:1-16:6  {a} -> {b} -> a -> b->a
-testdata/Prelude.lc 16:13-16:14  V3
+testdata/Prelude.lc 16:13-16:14  d_
 testdata/Prelude.lc 18:1-18:10  Bool
 testdata/Prelude.lc 18:13-18:17  Bool
 testdata/Prelude.lc 20:3-20:4  {a} -> {b} -> a -> a->b -> b
-testdata/Prelude.lc 20:9-20:10  V1
-testdata/Prelude.lc 20:11-20:12  V6
+testdata/Prelude.lc 20:9-20:10  b_
+testdata/Prelude.lc 20:11-20:12  g_
 testdata/Prelude.lc 22:2-22:3  {a} -> {b} -> a->b -> a->b
-testdata/Prelude.lc 22:15-22:16  V3
-testdata/Prelude.lc 22:17-22:18  V4
+testdata/Prelude.lc 22:15-22:16  d_
+testdata/Prelude.lc 22:17-22:18  e_
 testdata/Prelude.lc 23:2-23:3  {a} -> {b} -> {c} -> b->c -> a->b -> a->c
-testdata/Prelude.lc 23:17-23:18  V5
-testdata/Prelude.lc 23:20-23:21  V6
-testdata/Prelude.lc 23:22-23:23  V7
+testdata/Prelude.lc 23:17-23:18  f_
+testdata/Prelude.lc 23:20-23:21  g_
+testdata/Prelude.lc 23:22-23:23  h_
 testdata/Prelude.lc 25:1-25:8  {a} -> {b} -> {c} -> (a -> c->b) -> (a, c)->b
-testdata/Prelude.lc 25:20-25:21  V14
-testdata/Prelude.lc 25:20-25:25  HList V2 -> V2 | V2 | V2 -> HList V2 -> V2 | V3
-testdata/Prelude.lc 25:22-25:23  V13
-testdata/Prelude.lc 25:24-25:25  V9
+testdata/Prelude.lc 25:20-25:21  o_
+testdata/Prelude.lc 25:20-25:25  HList c_ -> c_ | c_ | c_ -> HList c_ -> c_ | d_
+testdata/Prelude.lc 25:22-25:23  n_
+testdata/Prelude.lc 25:24-25:25  j_
 testdata/Prelude.lc 27:2-27:5  {a} -> {b} -> {c} -> {d} -> a->c -> b->d -> (a, b)->(c, d)
-testdata/Prelude.lc 27:20-27:30  (V1, V0) | HList V2 -> V2 | V2 -> HList V2 -> V2
-testdata/Prelude.lc 27:21-27:22  V18
-testdata/Prelude.lc 27:23-27:24  V15
-testdata/Prelude.lc 27:26-27:27  V17
-testdata/Prelude.lc 27:26-27:29  ((V0))
-testdata/Prelude.lc 27:28-27:29  V11
+testdata/Prelude.lc 27:20-27:30  (b_, a_) | HList c_ -> c_ | c_ -> HList c_ -> c_
+testdata/Prelude.lc 27:21-27:22  s_
+testdata/Prelude.lc 27:23-27:24  p_
+testdata/Prelude.lc 27:26-27:27  r_
+testdata/Prelude.lc 27:26-27:29  ((a_))
+testdata/Prelude.lc 27:28-27:29  l_
 testdata/Prelude.lc 29:1-29:3  Float
 testdata/Prelude.lc 29:6-29:23  Float
 testdata/Prelude.lc 31:8-31:11  Type
 testdata/Prelude.lc 31:8-31:29  Type
-testdata/Prelude.lc 31:8-34:39  V0->V1 | {a} -> {b} -> List a -> List b -> List (a, b)
-testdata/Prelude.lc 31:9-31:10  V3
+testdata/Prelude.lc 31:8-34:39  a_->b_ | {a} -> {b} -> List a -> List b -> List (a, b)
+testdata/Prelude.lc 31:9-31:10  d_
 testdata/Prelude.lc 31:15-31:18  Type
 testdata/Prelude.lc 31:15-31:29  Type
-testdata/Prelude.lc 31:16-31:17  V2
+testdata/Prelude.lc 31:16-31:17  c_
 testdata/Prelude.lc 31:22-31:29  Type
 testdata/Prelude.lc 31:23-31:28  Type
 testdata/Prelude.lc 31:24-31:25  Type
@@ -214,27 +214,27 @@ testdata/Prelude.lc 31:24-31:27  List Type
 testdata/Prelude.lc 31:26-31:27  List Type | Type
 testdata/Prelude.lc 32:1-32:4  {a} -> {b} -> List a -> List b -> List (a, b)
 testdata/Prelude.lc 32:22-32:24  {a} -> List a
-testdata/Prelude.lc 32:22-34:39  List (V3, V2) | List V0 -> List (V1, V4) | List V1 -> List (V3, V2) | List V1 -> List V1 -> List (V3, V2)
+testdata/Prelude.lc 32:22-34:39  List (d_, c_) | List a_ -> List (b_, e_) | List b_ -> List (d_, c_) | List b_ -> List b_ -> List (d_, c_)
 testdata/Prelude.lc 33:22-33:24  {a} -> List a
-testdata/Prelude.lc 33:22-34:39  List (V2, V5) | List V0 -> List (V5, V1) | List V2 -> List V2 | V1 -> List V2 -> List V2
-testdata/Prelude.lc 34:23-34:28  (V7, V3)
-testdata/Prelude.lc 34:23-34:29  List (V7, V3) -> List (V8, V4)
-testdata/Prelude.lc 34:23-34:39  List (V6, V2) | List V2 -> List V2 | V1 -> List V2 -> List V2
-testdata/Prelude.lc 34:24-34:25  V10
-testdata/Prelude.lc 34:26-34:27  ((V3)) | V6
+testdata/Prelude.lc 33:22-34:39  List (c_, f_) | List a_ -> List (f_, b_) | List c_ -> List c_ | b_ -> List c_ -> List c_
+testdata/Prelude.lc 34:23-34:28  (h_, d_)
+testdata/Prelude.lc 34:23-34:29  List (h_, d_) -> List (i_, e_)
+testdata/Prelude.lc 34:23-34:39  List (g_, c_) | List c_ -> List c_ | b_ -> List c_ -> List c_
+testdata/Prelude.lc 34:24-34:25  k_
+testdata/Prelude.lc 34:26-34:27  ((d_)) | g_
 testdata/Prelude.lc 34:28-34:29  {a} -> a -> List a -> List a
 testdata/Prelude.lc 34:30-34:33  {a} -> {b} -> List a -> List b -> List (a, b)
-testdata/Prelude.lc 34:30-34:36  List V0 -> List (V8, V1)
-testdata/Prelude.lc 34:30-34:39  List (V6, V2)
-testdata/Prelude.lc 34:34-34:36  List V8
-testdata/Prelude.lc 34:37-34:39  List V2
+testdata/Prelude.lc 34:30-34:36  List a_ -> List (i_, b_)
+testdata/Prelude.lc 34:30-34:39  List (g_, c_)
+testdata/Prelude.lc 34:34-34:36  List i_
+testdata/Prelude.lc 34:37-34:39  List c_
 testdata/Prelude.lc 36:10-36:17  Type
 testdata/Prelude.lc 36:10-36:30  Type
-testdata/Prelude.lc 36:10-39:27  V0->V1 | {a} -> {b} -> List (a, b) -> (List a, List b)
+testdata/Prelude.lc 36:10-39:27  a_->b_ | {a} -> {b} -> List (a, b) -> (List a, List b)
 testdata/Prelude.lc 36:11-36:16  Type
-testdata/Prelude.lc 36:12-36:13  V4
+testdata/Prelude.lc 36:12-36:13  e_
 testdata/Prelude.lc 36:12-36:15  List Type
-testdata/Prelude.lc 36:14-36:15  List Type | V2
+testdata/Prelude.lc 36:14-36:15  List Type | c_
 testdata/Prelude.lc 36:21-36:30  Type
 testdata/Prelude.lc 36:22-36:25  Type
 testdata/Prelude.lc 36:22-36:29  List Type
@@ -242,57 +242,57 @@ testdata/Prelude.lc 36:23-36:24  Type
 testdata/Prelude.lc 36:26-36:29  List Type | Type
 testdata/Prelude.lc 36:27-36:28  Type
 testdata/Prelude.lc 37:1-37:6  {a} -> {b} -> List (a, b) -> (List a, List b)
-testdata/Prelude.lc 37:12-37:19  (List V1, List V0)
-testdata/Prelude.lc 37:12-39:27  (List V2, List V1) | List (V1, V0) -> (List V2, List V1)
+testdata/Prelude.lc 37:12-37:19  (List b_, List a_)
+testdata/Prelude.lc 37:12-39:27  (List c_, List b_) | List (b_, a_) -> (List c_, List b_)
 testdata/Prelude.lc 37:13-37:15  {a} -> List a
-testdata/Prelude.lc 37:16-37:18  ((List V0)) | {a} -> List a
-testdata/Prelude.lc 38:20-38:31  (List V13, List V8)
-testdata/Prelude.lc 38:20-39:27  (List V3, List V0) | (List V3, List V2) | (List V7, List V2) | HList V2 -> V2 | List V3 -> (List V3, List V2) | V2 -> HList V2 -> V2 | V2 -> List V3 -> (List V3, List V2)
-testdata/Prelude.lc 38:21-38:22  V18
-testdata/Prelude.lc 38:21-38:23  List V17 -> List V18
-testdata/Prelude.lc 38:21-38:25  List V15
+testdata/Prelude.lc 37:16-37:18  ((List a_)) | {a} -> List a
+testdata/Prelude.lc 38:20-38:31  (List n_, List i_)
+testdata/Prelude.lc 38:20-39:27  (List d_, List a_) | (List d_, List c_) | (List h_, List c_) | HList c_ -> c_ | List d_ -> (List d_, List c_) | c_ -> HList c_ -> c_ | c_ -> List d_ -> (List d_, List c_)
+testdata/Prelude.lc 38:21-38:22  s_
+testdata/Prelude.lc 38:21-38:23  List r_ -> List s_
+testdata/Prelude.lc 38:21-38:25  List p_
 testdata/Prelude.lc 38:22-38:23  {a} -> a -> List a -> List a
-testdata/Prelude.lc 38:23-38:25  List V5
-testdata/Prelude.lc 38:26-38:27  V13
-testdata/Prelude.lc 38:26-38:28  List V12 -> List V13
-testdata/Prelude.lc 38:26-38:30  ((List V8)) | List V10
+testdata/Prelude.lc 38:23-38:25  List f_
+testdata/Prelude.lc 38:26-38:27  n_
+testdata/Prelude.lc 38:26-38:28  List m_ -> List n_
+testdata/Prelude.lc 38:26-38:30  ((List i_)) | List k_
 testdata/Prelude.lc 38:27-38:28  {a} -> a -> List a -> List a
-testdata/Prelude.lc 38:28-38:30  List V5
-testdata/Prelude.lc 39:10-39:12  HList V2 -> V2 | V10 | V2 -> HList V2 -> V2 | V3 | V7
-testdata/Prelude.lc 39:10-39:15  (List V4, List V3) | (List V5, List V4)
-testdata/Prelude.lc 39:13-39:15  HList V2 -> V2 | V2 | V2 -> HList V2 -> V2 | V5
+testdata/Prelude.lc 38:28-38:30  List f_
+testdata/Prelude.lc 39:10-39:12  HList c_ -> c_ | c_ -> HList c_ -> c_ | d_ | h_ | k_
+testdata/Prelude.lc 39:10-39:15  (List e_, List d_) | (List f_, List e_)
+testdata/Prelude.lc 39:13-39:15  HList c_ -> c_ | c_ | c_ -> HList c_ -> c_ | f_
 testdata/Prelude.lc 39:19-39:24  {a} -> {b} -> List (a, b) -> (List a, List b)
-testdata/Prelude.lc 39:19-39:27  (List V1, List V0)
-testdata/Prelude.lc 39:25-39:27  List V17
+testdata/Prelude.lc 39:19-39:27  (List b_, List a_)
+testdata/Prelude.lc 39:25-39:27  List r_
 testdata/Prelude.lc 41:1-41:7  {a} -> a->Bool -> List a -> List a
 testdata/Prelude.lc 41:21-41:23  {a} -> List a
-testdata/Prelude.lc 41:21-44:49  List V0 -> List V1 | V0->V1
-testdata/Prelude.lc 42:22-44:49  List V2 | List V2 -> List V2 | V1 -> List V2 -> List V2
-testdata/Prelude.lc 42:27-42:31  V6
-testdata/Prelude.lc 42:32-42:33  V5
-testdata/Prelude.lc 43:32-44:49  Bool -> List V6
-testdata/Prelude.lc 43:33-43:34  V7
-testdata/Prelude.lc 43:33-43:36  List V6 -> List V7
-testdata/Prelude.lc 43:33-43:51  List V5
+testdata/Prelude.lc 41:21-44:49  List a_ -> List b_ | a_->b_
+testdata/Prelude.lc 42:22-44:49  List c_ | List c_ -> List c_ | b_ -> List c_ -> List c_
+testdata/Prelude.lc 42:27-42:31  g_
+testdata/Prelude.lc 42:32-42:33  f_
+testdata/Prelude.lc 43:32-44:49  Bool -> List g_
+testdata/Prelude.lc 43:33-43:34  h_
+testdata/Prelude.lc 43:33-43:36  List g_ -> List h_
+testdata/Prelude.lc 43:33-43:51  List f_
 testdata/Prelude.lc 43:35-43:36  {a} -> a -> List a -> List a
-testdata/Prelude.lc 43:37-43:43  V9 -> List V6 -> List V7
-testdata/Prelude.lc 43:37-43:48  List V5 -> List V6
-testdata/Prelude.lc 43:37-43:51  List V5
-testdata/Prelude.lc 43:44-43:48  V9
-testdata/Prelude.lc 43:49-43:51  List V5
-testdata/Prelude.lc 44:34-44:40  V12
-testdata/Prelude.lc 44:41-44:45  V13
-testdata/Prelude.lc 44:46-44:48  List V10
+testdata/Prelude.lc 43:37-43:43  j_ -> List g_ -> List h_
+testdata/Prelude.lc 43:37-43:48  List f_ -> List g_
+testdata/Prelude.lc 43:37-43:51  List f_
+testdata/Prelude.lc 43:44-43:48  j_
+testdata/Prelude.lc 43:49-43:51  List f_
+testdata/Prelude.lc 44:34-44:40  m_
+testdata/Prelude.lc 44:41-44:45  n_
+testdata/Prelude.lc 44:46-44:48  List k_
 testdata/Prelude.lc 49:9-49:12  Type
 testdata/Prelude.lc 49:9-49:19  Type
-testdata/Prelude.lc 49:10-49:11  V1
+testdata/Prelude.lc 49:10-49:11  b_
 testdata/Prelude.lc 49:16-49:19  Type
 testdata/Prelude.lc 49:17-49:18  Type
 testdata/Prelude.lc 50:1-50:5  {a} -> List a -> List a
-testdata/Prelude.lc 50:16-50:18  List V0 -> List V1 | List V1 | List V2 -> V2 | List V3 | V1 -> List V2 -> V2
+testdata/Prelude.lc 50:16-50:18  List a_ -> List b_ | List b_ | List c_ -> c_ | List d_ | b_ -> List c_ -> c_
 testdata/Prelude.lc 52:10-52:13  Type
 testdata/Prelude.lc 52:10-52:25  Type
-testdata/Prelude.lc 52:11-52:12  V1
+testdata/Prelude.lc 52:11-52:12  b_
 testdata/Prelude.lc 52:17-52:25  Type
 testdata/Prelude.lc 52:18-52:24  Type
 testdata/Prelude.lc 52:19-52:20  Type
@@ -300,138 +300,138 @@ testdata/Prelude.lc 52:19-52:23  List Type
 testdata/Prelude.lc 52:22-52:23  List Type | Type
 testdata/Prelude.lc 53:1-53:6  {a} -> List a -> List (a, a)
 testdata/Prelude.lc 53:11-53:14  {a} -> {b} -> List a -> List b -> List (a, b)
-testdata/Prelude.lc 53:11-53:16  List V0 -> List (V3, V1)
-testdata/Prelude.lc 53:11-53:25  List (V1, V1) | List V0 -> List (V1, V1)
-testdata/Prelude.lc 53:15-53:16  List V3
+testdata/Prelude.lc 53:11-53:16  List a_ -> List (d_, b_)
+testdata/Prelude.lc 53:11-53:25  List (b_, b_) | List a_ -> List (b_, b_)
+testdata/Prelude.lc 53:15-53:16  List d_
 testdata/Prelude.lc 53:18-53:22  {a} -> List a -> List a
-testdata/Prelude.lc 53:18-53:24  List V1
-testdata/Prelude.lc 53:23-53:24  List V2
+testdata/Prelude.lc 53:18-53:24  List b_
+testdata/Prelude.lc 53:23-53:24  List c_
 testdata/Prelude.lc 55:1-55:7  {a} -> {b} -> (a -> b->a) -> a -> List b -> a
-testdata/Prelude.lc 55:17-55:18  V5
-testdata/Prelude.lc 55:17-56:41  List V1 -> V6 | V0->V1
-testdata/Prelude.lc 56:22-56:28  V10
-testdata/Prelude.lc 56:22-56:41  List V1 -> V6 | V0 -> List V1 -> V6
-testdata/Prelude.lc 56:29-56:30  V11
-testdata/Prelude.lc 56:32-56:33  V12
-testdata/Prelude.lc 56:34-56:35  V13
-testdata/Prelude.lc 56:36-56:37  V10
-testdata/Prelude.lc 56:39-56:41  List V7
+testdata/Prelude.lc 55:17-55:18  f_
+testdata/Prelude.lc 55:17-56:41  List b_ -> g_ | a_->b_
+testdata/Prelude.lc 56:22-56:28  k_
+testdata/Prelude.lc 56:22-56:41  List b_ -> g_ | a_ -> List b_ -> g_
+testdata/Prelude.lc 56:29-56:30  l_
+testdata/Prelude.lc 56:32-56:33  m_
+testdata/Prelude.lc 56:34-56:35  n_
+testdata/Prelude.lc 56:36-56:37  k_
+testdata/Prelude.lc 56:39-56:41  List h_
 testdata/Prelude.lc 58:1-58:7  {a} -> (a -> a->a) -> List a -> a
 testdata/Prelude.lc 58:20-58:25  {a} -> {b} -> (b -> a->a) -> a -> List b -> a
-testdata/Prelude.lc 58:20-58:27  V1 -> List V1 -> V3
-testdata/Prelude.lc 58:20-58:29  List V0 -> V5
-testdata/Prelude.lc 58:20-58:32  List V2 -> V2 | V1 -> List V2 -> V2 | V2
-testdata/Prelude.lc 58:26-58:27  V9
-testdata/Prelude.lc 58:28-58:29  V5
-testdata/Prelude.lc 58:30-58:32  List V3
+testdata/Prelude.lc 58:20-58:27  b_ -> List b_ -> d_
+testdata/Prelude.lc 58:20-58:29  List a_ -> f_
+testdata/Prelude.lc 58:20-58:32  List c_ -> c_ | b_ -> List c_ -> c_ | c_
+testdata/Prelude.lc 58:26-58:27  j_
+testdata/Prelude.lc 58:28-58:29  f_
+testdata/Prelude.lc 58:30-58:32  List d_
 testdata/Prelude.lc 60:1-60:6  {a} -> List a -> (List a, List a)
-testdata/Prelude.lc 60:12-60:20  (List V1, List V0)
-testdata/Prelude.lc 60:12-61:55  List V1 -> (List V2, List V1) | V0->V1
+testdata/Prelude.lc 60:12-60:20  (List b_, List a_)
+testdata/Prelude.lc 60:12-61:55  List b_ -> (List c_, List b_) | a_->b_
 testdata/Prelude.lc 60:13-60:15  {a} -> List a
-testdata/Prelude.lc 60:17-60:19  ((List V0)) | {a} -> List a
-testdata/Prelude.lc 61:17-61:28  (List V8, V2)
-testdata/Prelude.lc 61:17-61:55  List V3 -> (List V3, List V2) | V2 -> List V3 -> (List V3, List V2)
-testdata/Prelude.lc 61:18-61:19  V12
-testdata/Prelude.lc 61:18-61:20  List V11 -> List V12
-testdata/Prelude.lc 61:18-61:23  List V9
+testdata/Prelude.lc 60:17-60:19  ((List a_)) | {a} -> List a
+testdata/Prelude.lc 61:17-61:28  (List i_, c_)
+testdata/Prelude.lc 61:17-61:55  List d_ -> (List d_, List c_) | c_ -> List d_ -> (List d_, List c_)
+testdata/Prelude.lc 61:18-61:19  m_
+testdata/Prelude.lc 61:18-61:20  List l_ -> List m_
+testdata/Prelude.lc 61:18-61:23  List j_
 testdata/Prelude.lc 61:19-61:20  {a} -> a -> List a -> List a
-testdata/Prelude.lc 61:21-61:23  V3
-testdata/Prelude.lc 61:25-61:27  ((V2)) | V5
-testdata/Prelude.lc 61:37-61:39  HList V2 -> V2 | V10 | V2 -> HList V2 -> V2 | V3 | V7
-testdata/Prelude.lc 61:37-61:43  (V4, V3) | V3
-testdata/Prelude.lc 61:41-61:43  HList V2 -> V2 | V2 | V2 -> HList V2 -> V2 | V5
-testdata/Prelude.lc 61:47-61:52  V8
-testdata/Prelude.lc 61:53-61:55  List V7
+testdata/Prelude.lc 61:21-61:23  d_
+testdata/Prelude.lc 61:25-61:27  ((c_)) | f_
+testdata/Prelude.lc 61:37-61:39  HList c_ -> c_ | c_ -> HList c_ -> c_ | d_ | h_ | k_
+testdata/Prelude.lc 61:37-61:43  (e_, d_) | d_
+testdata/Prelude.lc 61:41-61:43  HList c_ -> c_ | c_ | c_ -> HList c_ -> c_ | f_
+testdata/Prelude.lc 61:47-61:52  i_
+testdata/Prelude.lc 61:53-61:55  List h_
 testdata/Prelude.lc 63:1-63:8  {a} -> (a -> a->Ordering) -> List a -> List a -> List a
-testdata/Prelude.lc 63:27-65:32  List V1 -> V9 | List V4 | V0 -> List V1 -> V9
-testdata/Prelude.lc 63:27-67:21  List V1 -> V4 | List V2 | List V2 -> List V3 | V0 -> List V1 -> V4 | V0->V1
-testdata/Prelude.lc 63:32-63:33  V9
-testdata/Prelude.lc 63:34-63:35  V7
-testdata/Prelude.lc 63:36-63:37  V8
-testdata/Prelude.lc 64:11-64:12  V9
-testdata/Prelude.lc 64:11-64:13  List V8 -> List V9
-testdata/Prelude.lc 64:11-64:33  List V7
-testdata/Prelude.lc 64:11-65:32  List V6 -> Ordering -> List V8
+testdata/Prelude.lc 63:27-65:32  List b_ -> j_ | List e_ | a_ -> List b_ -> j_
+testdata/Prelude.lc 63:27-67:21  List b_ -> e_ | List c_ | List c_ -> List d_ | a_ -> List b_ -> e_ | a_->b_
+testdata/Prelude.lc 63:32-63:33  j_
+testdata/Prelude.lc 63:34-63:35  h_
+testdata/Prelude.lc 63:36-63:37  i_
+testdata/Prelude.lc 64:11-64:12  j_
+testdata/Prelude.lc 64:11-64:13  List i_ -> List j_
+testdata/Prelude.lc 64:11-64:33  List h_
+testdata/Prelude.lc 64:11-65:32  List g_ -> Ordering -> List i_
 testdata/Prelude.lc 64:12-64:13  {a} -> a -> List a -> List a
-testdata/Prelude.lc 64:14-64:21  V15
-testdata/Prelude.lc 64:22-64:23  V16
-testdata/Prelude.lc 64:24-64:26  List V11
-testdata/Prelude.lc 64:28-64:29  V9
-testdata/Prelude.lc 64:28-64:30  List V8 -> List V9
-testdata/Prelude.lc 64:28-64:32  List V8
+testdata/Prelude.lc 64:14-64:21  p_
+testdata/Prelude.lc 64:22-64:23  q_
+testdata/Prelude.lc 64:24-64:26  List l_
+testdata/Prelude.lc 64:28-64:29  j_
+testdata/Prelude.lc 64:28-64:30  List i_ -> List j_
+testdata/Prelude.lc 64:28-64:32  List i_
 testdata/Prelude.lc 64:29-64:30  {a} -> a -> List a -> List a
-testdata/Prelude.lc 64:30-64:32  List V8
-testdata/Prelude.lc 65:10-65:11  V5 | V7
-testdata/Prelude.lc 65:10-65:12  List V4 -> List V5 | List V6 -> List V7
-testdata/Prelude.lc 65:10-65:32  List V6
+testdata/Prelude.lc 64:30-64:32  List i_
+testdata/Prelude.lc 65:10-65:11  f_ | h_
+testdata/Prelude.lc 65:10-65:12  List e_ -> List f_ | List g_ -> List h_
+testdata/Prelude.lc 65:10-65:32  List g_
 testdata/Prelude.lc 65:11-65:12  {a} -> a -> List a -> List a
-testdata/Prelude.lc 65:13-65:20  V12 -> List V7 -> List V8 -> List V9
-testdata/Prelude.lc 65:13-65:22  List V6 -> List V7 -> List V8
-testdata/Prelude.lc 65:13-65:29  List V6 -> List V7
-testdata/Prelude.lc 65:13-65:32  List V6
-testdata/Prelude.lc 65:21-65:22  V12
-testdata/Prelude.lc 65:24-65:25  V7
-testdata/Prelude.lc 65:24-65:26  List V6 -> List V7
-testdata/Prelude.lc 65:24-65:28  List V6
+testdata/Prelude.lc 65:13-65:20  m_ -> List h_ -> List i_ -> List j_
+testdata/Prelude.lc 65:13-65:22  List g_ -> List h_ -> List i_
+testdata/Prelude.lc 65:13-65:29  List g_ -> List h_
+testdata/Prelude.lc 65:13-65:32  List g_
+testdata/Prelude.lc 65:21-65:22  m_
+testdata/Prelude.lc 65:24-65:25  h_
+testdata/Prelude.lc 65:24-65:26  List g_ -> List h_
+testdata/Prelude.lc 65:24-65:28  List g_
 testdata/Prelude.lc 65:25-65:26  {a} -> a -> List a -> List a
-testdata/Prelude.lc 65:26-65:28  List V6
-testdata/Prelude.lc 65:30-65:32  List V6
-testdata/Prelude.lc 66:19-66:21  V3
-testdata/Prelude.lc 67:19-67:21  V8
+testdata/Prelude.lc 65:26-65:28  List g_
+testdata/Prelude.lc 65:30-65:32  List g_
+testdata/Prelude.lc 66:19-66:21  d_
+testdata/Prelude.lc 67:19-67:21  i_
 testdata/Prelude.lc 69:1-69:7  {a} -> (a -> a->Ordering) -> List a -> List a
 testdata/Prelude.lc 69:15-69:17  {a} -> List a
-testdata/Prelude.lc 69:15-71:71  List V1 -> List V2 | V0->V1
-testdata/Prelude.lc 70:16-70:19  List V4
-testdata/Prelude.lc 70:16-71:71  List V1 -> List V6 | List V2 -> List V2 | List V3 | V1 -> List V2 -> List V2
-testdata/Prelude.lc 70:17-70:18  V6
+testdata/Prelude.lc 69:15-71:71  List b_ -> List c_ | a_->b_
+testdata/Prelude.lc 70:16-70:19  List e_
+testdata/Prelude.lc 70:16-71:71  List b_ -> List g_ | List c_ -> List c_ | List d_ | b_ -> List c_ -> List c_
+testdata/Prelude.lc 70:17-70:18  g_
 testdata/Prelude.lc 71:15-71:22  {a} -> {b} -> {c} -> (a -> c->b) -> (a, c)->b
-testdata/Prelude.lc 71:15-71:34  (List V0, List V0) -> List V1
-testdata/Prelude.lc 71:15-71:71  List V1 -> List V6 | List V7 | V0 -> List V1 -> List V6
+testdata/Prelude.lc 71:15-71:34  (List a_, List a_) -> List b_
+testdata/Prelude.lc 71:15-71:71  List b_ -> List g_ | List h_ | a_ -> List b_ -> List g_
 testdata/Prelude.lc 71:24-71:31  {a} -> (a -> a->Ordering) -> List a -> List a -> List a
-testdata/Prelude.lc 71:24-71:33  List V0 -> List V1 -> List V2
-testdata/Prelude.lc 71:32-71:33  V14
-testdata/Prelude.lc 71:36-71:70  (List V7, List V7)
-testdata/Prelude.lc 71:37-71:43  V15
-testdata/Prelude.lc 71:37-71:49  V2->V1 -> (V4, V3)->(V3, V2)
-testdata/Prelude.lc 71:37-71:58  (V1, V1)->(V1, V1)
-testdata/Prelude.lc 71:44-71:45  V13 -> V14->Ordering
+testdata/Prelude.lc 71:24-71:33  List a_ -> List b_ -> List c_
+testdata/Prelude.lc 71:32-71:33  o_
+testdata/Prelude.lc 71:36-71:70  (List h_, List h_)
+testdata/Prelude.lc 71:37-71:43  p_
+testdata/Prelude.lc 71:37-71:49  c_->b_ -> (e_, d_)->(d_, c_)
+testdata/Prelude.lc 71:37-71:58  (b_, b_)->(b_, b_)
+testdata/Prelude.lc 71:44-71:45  n_ -> o_->Ordering
 testdata/Prelude.lc 71:46-71:49  {a} -> {b} -> {c} -> {d} -> a->c -> b->d -> (a, b)->(c, d)
-testdata/Prelude.lc 71:50-71:56  (V10 -> V11->Ordering) -> V4->V3
-testdata/Prelude.lc 71:50-71:58  V1->V1
-testdata/Prelude.lc 71:57-71:58  V8 -> V9->Ordering
+testdata/Prelude.lc 71:50-71:56  (k_ -> l_->Ordering) -> e_->d_
+testdata/Prelude.lc 71:50-71:58  b_->b_
+testdata/Prelude.lc 71:57-71:58  i_ -> j_->Ordering
 testdata/Prelude.lc 71:61-71:66  {a} -> List a -> (List a, List a)
-testdata/Prelude.lc 71:61-71:69  (List V0, List V0)
-testdata/Prelude.lc 71:67-71:69  V10
+testdata/Prelude.lc 71:61-71:69  (List a_, List a_)
+testdata/Prelude.lc 71:67-71:69  k_
 testdata/Prelude.lc 73:12-73:32  Type
-testdata/Prelude.lc 73:12-74:35  V0->V1 | {a} -> a->a -> a -> List a
-testdata/Prelude.lc 73:13-73:14  V1
+testdata/Prelude.lc 73:12-74:35  a_->b_ | {a} -> a->a -> a -> List a
+testdata/Prelude.lc 73:13-73:14  b_
 testdata/Prelude.lc 73:18-73:19  Type
 testdata/Prelude.lc 73:24-73:25  Type
 testdata/Prelude.lc 73:24-73:32  Type
 testdata/Prelude.lc 73:29-73:32  Type
 testdata/Prelude.lc 73:30-73:31  Type
 testdata/Prelude.lc 74:1-74:8  {a} -> a->a -> a -> List a
-testdata/Prelude.lc 74:16-74:17  V3
-testdata/Prelude.lc 74:16-74:19  List V2 -> List V3
-testdata/Prelude.lc 74:16-74:35  List V2 | V0->V1 -> V1 -> List V2 | V1 -> List V2
+testdata/Prelude.lc 74:16-74:17  d_
+testdata/Prelude.lc 74:16-74:19  List c_ -> List d_
+testdata/Prelude.lc 74:16-74:35  List c_ | a_->b_ -> b_ -> List c_ | b_ -> List c_
 testdata/Prelude.lc 74:18-74:19  {a} -> a -> List a -> List a
 testdata/Prelude.lc 74:20-74:27  {a} -> a->a -> a -> List a
-testdata/Prelude.lc 74:20-74:29  V2 -> List V3
-testdata/Prelude.lc 74:20-74:35  List V2
-testdata/Prelude.lc 74:28-74:29  V3->V4
-testdata/Prelude.lc 74:31-74:32  V2->V3
-testdata/Prelude.lc 74:31-74:34  V2
-testdata/Prelude.lc 74:33-74:34  V2
+testdata/Prelude.lc 74:20-74:29  c_ -> List d_
+testdata/Prelude.lc 74:20-74:35  List c_
+testdata/Prelude.lc 74:28-74:29  d_->e_
+testdata/Prelude.lc 74:31-74:32  c_->d_
+testdata/Prelude.lc 74:31-74:34  c_
+testdata/Prelude.lc 74:33-74:34  c_
 testdata/Prelude.lc 76:1-76:4  {a} -> {b} -> (a, b)->a
-testdata/Prelude.lc 76:14-76:15  HList V2 -> V2 | V10 | V2 -> HList V2 -> V2 | V3 | V7
+testdata/Prelude.lc 76:14-76:15  HList c_ -> c_ | c_ -> HList c_ -> c_ | d_ | h_ | k_
 testdata/Prelude.lc 77:1-77:4  {a} -> {b} -> (a, b)->b
-testdata/Prelude.lc 77:14-77:15  HList V2 -> V2 | V2 | V2 -> HList V2 -> V2 | V5
+testdata/Prelude.lc 77:14-77:15  HList c_ -> c_ | c_ | c_ -> HList c_ -> c_ | f_
 testdata/Prelude.lc 79:7-79:10  Bool -> Bool->Bool
-testdata/Prelude.lc 79:15-79:16  V2
+testdata/Prelude.lc 79:15-79:16  c_
 testdata/Prelude.lc 79:15-80:18  Bool->Bool
 testdata/Prelude.lc 80:14-80:18  Bool
 testdata/Prelude.lc 84:6-84:9  Bool -> Bool->Bool
-testdata/Prelude.lc 84:14-84:15  V1
+testdata/Prelude.lc 84:14-84:15  b_
 testdata/Prelude.lc 84:14-85:20  Bool->Bool
 testdata/Prelude.lc 85:15-85:20  Bool
 testdata/Prelude.lc 122:6-122:13  Type
@@ -441,7 +441,7 @@ testdata/Prelude.lc 122:16-122:23  RecItem | String -> Type->RecItem | Type
 testdata/Prelude.lc 122:24-122:30  Type
 testdata/Prelude.lc 122:31-122:35  Type
 testdata/Prelude.lc 124:1-124:12  RecItem->Type
-testdata/Prelude.lc 124:29-124:30  String -> Type->V2 | Type | Type->V2
+testdata/Prelude.lc 124:29-124:30  String -> Type->c_ | Type | Type->c_
 testdata/Prelude.lc 126:6-126:13  List RecItem -> Type | Type
 testdata/Prelude.lc 126:6-126:17  Type
 testdata/Prelude.lc 126:6-127:17  Type
@@ -449,7 +449,7 @@ testdata/Prelude.lc 126:6-127:46  Type
 testdata/Prelude.lc 126:15-126:17  List RecItem
 testdata/Prelude.lc 126:21-126:30  Type
 testdata/Prelude.lc 126:22-126:29  Type
-testdata/Prelude.lc 127:7-127:17  RecordC V2 | Type | {a : List RecItem} -> HList ('map RecItem Type 'recItemType a) -> RecordC a
+testdata/Prelude.lc 127:7-127:17  RecordC c_ | Type | {a : List RecItem} -> HList ('map RecItem Type 'recItemType a) -> RecordC a
 testdata/Prelude.lc 127:19-127:24  List Type -> Type
 testdata/Prelude.lc 127:19-127:45  Type
 testdata/Prelude.lc 127:26-127:29  {a} -> {b} -> a->b -> List a -> List b
@@ -460,37 +460,37 @@ testdata/Prelude.lc 127:42-127:44  List RecItem
 testdata/Prelude.lc 129:1-129:7  String -> Type -> List RecItem -> Type
 testdata/Prelude.lc 129:17-129:23  String->Type
 testdata/Prelude.lc 129:17-129:26  Type
-testdata/Prelude.lc 129:17-130:75  List RecItem -> Type | V0->V1
+testdata/Prelude.lc 129:17-130:75  List RecItem -> Type | a_->b_
 testdata/Prelude.lc 129:24-129:26  String
-testdata/Prelude.lc 130:34-130:75  List V1 -> Type | String -> Type->V2 | Type | Type->V2 | V0 -> List V1 -> Type
-testdata/Prelude.lc 130:37-130:38  V14
-testdata/Prelude.lc 130:37-130:41  V13->Bool
+testdata/Prelude.lc 130:34-130:75  List b_ -> Type | String -> Type->c_ | Type | Type->c_ | a_ -> List b_ -> Type
+testdata/Prelude.lc 130:37-130:38  o_
+testdata/Prelude.lc 130:37-130:41  n_->Bool
 testdata/Prelude.lc 130:37-130:44  Bool
 testdata/Prelude.lc 130:37-130:56  Type->Type
 testdata/Prelude.lc 130:39-130:41  {a} -> {_ : Eq a} -> a -> a->Bool
 testdata/Prelude.lc 130:42-130:44  String
-testdata/Prelude.lc 130:50-130:51  V11
-testdata/Prelude.lc 130:50-130:53  V10->Type
+testdata/Prelude.lc 130:50-130:51  l_
+testdata/Prelude.lc 130:50-130:53  k_->Type
 testdata/Prelude.lc 130:50-130:56  Type
 testdata/Prelude.lc 130:52-130:53  {a} -> a -> a->Type
 testdata/Prelude.lc 130:54-130:56  Type
-testdata/Prelude.lc 130:62-130:68  V10
+testdata/Prelude.lc 130:62-130:68  k_
 testdata/Prelude.lc 130:69-130:70  String
 testdata/Prelude.lc 130:71-130:72  Type
-testdata/Prelude.lc 130:73-130:75  List V8
+testdata/Prelude.lc 130:73-130:75  List i_
 testdata/Prelude.lc 132:1-132:7  {a} -> {b : List Type} -> HList ('Cons a b) -> a
 testdata/Prelude.lc 132:10-132:23  {a} -> {b : List Type} -> c:Type -> (a -> HList b -> c) -> HList ('Cons a b) -> c
-testdata/Prelude.lc 132:10-132:25  (V2 -> HList V2 -> V2) -> HList ('Cons V3 V2) -> V2
-testdata/Prelude.lc 132:10-132:37  HList ('Cons V1 V0) -> V2
-testdata/Prelude.lc 132:27-132:36  V2 -> HList V2 -> V2
-testdata/Prelude.lc 132:35-132:36  HList V2 -> V2 | V4
+testdata/Prelude.lc 132:10-132:25  (c_ -> HList c_ -> c_) -> HList ('Cons d_ c_) -> c_
+testdata/Prelude.lc 132:10-132:37  HList ('Cons b_ a_) -> c_
+testdata/Prelude.lc 132:27-132:36  c_ -> HList c_ -> c_
+testdata/Prelude.lc 132:35-132:36  HList c_ -> c_ | e_
 testdata/Prelude.lc 133:1-133:7  {a} -> {b : List Type} -> HList ('Cons a b) -> HList b
 testdata/Prelude.lc 133:10-133:23  {a} -> {b : List Type} -> c:Type -> (a -> HList b -> c) -> HList ('Cons a b) -> c
-testdata/Prelude.lc 133:10-133:25  (V2 -> HList V2 -> V2) -> HList ('Cons V3 V2) -> V2
-testdata/Prelude.lc 133:10-133:37  HList ('Cons V1 V0) -> HList V1
-testdata/Prelude.lc 133:27-133:36  V2 -> HList V2 -> V2
-testdata/Prelude.lc 133:35-133:36  HList V2 -> V2 | HList V3
-testdata/Prelude.lc 136:12-138:181  V0->V1 | {a} -> {b : List RecItem} -> c:String -> {_ : 'isKeyC c a b} -> RecordC b -> a
+testdata/Prelude.lc 133:10-133:25  (c_ -> HList c_ -> c_) -> HList ('Cons d_ c_) -> c_
+testdata/Prelude.lc 133:10-133:37  HList ('Cons b_ a_) -> HList b_
+testdata/Prelude.lc 133:27-133:36  c_ -> HList c_ -> c_
+testdata/Prelude.lc 133:35-133:36  HList c_ -> c_ | HList d_
+testdata/Prelude.lc 136:12-138:181  a_->b_ | {a} -> {b : List RecItem} -> c:String -> {_ : 'isKeyC c a b} -> RecordC b -> a
 testdata/Prelude.lc 136:28-136:37  Type
 testdata/Prelude.lc 136:28-136:97  Type
 testdata/Prelude.lc 136:29-136:36  Type
@@ -502,7 +502,7 @@ testdata/Prelude.lc 136:65-136:75  List RecItem -> Type
 testdata/Prelude.lc 136:65-136:78  Type
 testdata/Prelude.lc 136:65-136:97  Type
 testdata/Prelude.lc 136:72-136:73  String
-testdata/Prelude.lc 136:74-136:75  V3
+testdata/Prelude.lc 136:74-136:75  d_
 testdata/Prelude.lc 136:76-136:78  List RecItem
 testdata/Prelude.lc 136:82-136:89  List RecItem -> Type
 testdata/Prelude.lc 136:82-136:92  Type
@@ -513,16 +513,16 @@ testdata/Prelude.lc 137:1-137:8  {a} -> {b : List RecItem} -> c:String -> {_ : '
 testdata/Prelude.lc 137:57-137:58  String
 testdata/Prelude.lc 137:57-137:61  String->Bool
 testdata/Prelude.lc 137:57-137:64  Bool
-testdata/Prelude.lc 137:57-138:181  HList ('map RecItem Type 'recItemType V1) -> V1 | List V2 -> V2 | RecordC V2 -> V4 | String -> Type->V2 | Type->V2 | V1 -> List V2 -> V2 | V12 | V4 | V6 | V9 | a:String -> {_ : 'isKeyC a V2 V1} -> RecordC V2 -> V4 | {_ : 'isKeyC V0 V2 V1} -> RecordC V2 -> V4 | {a : List RecItem} -> b:String -> {_ : 'isKeyC b V2 a} -> RecordC a -> V4 | {a} -> {b : List RecItem} -> c:String -> {_ : 'isKeyC c a b} -> RecordC b -> a
+testdata/Prelude.lc 137:57-138:181  HList ('map RecItem Type 'recItemType b_) -> b_ | List c_ -> c_ | RecordC c_ -> e_ | String -> Type->c_ | Type->c_ | a:String -> {_ : 'isKeyC a c_ b_} -> RecordC c_ -> e_ | b_ -> List c_ -> c_ | e_ | g_ | j_ | m_ | {_ : 'isKeyC a_ c_ b_} -> RecordC c_ -> e_ | {a : List RecItem} -> b:String -> {_ : 'isKeyC b c_ a} -> RecordC a -> e_ | {a} -> {b : List RecItem} -> c:String -> {_ : 'isKeyC c a b} -> RecordC b -> a
 testdata/Prelude.lc 137:59-137:61  {a} -> {_ : Eq a} -> a -> a->Bool
 testdata/Prelude.lc 137:62-137:64  String
 testdata/Prelude.lc 137:67-137:73  {a} -> {b : List Type} -> HList ('Cons a b) -> a
-testdata/Prelude.lc 137:67-137:129  V13
-testdata/Prelude.lc 137:67-138:181  Bool->V14
+testdata/Prelude.lc 137:67-137:129  n_
+testdata/Prelude.lc 137:67-138:181  Bool->o_
 testdata/Prelude.lc 137:75-137:87  {a} -> {b} -> a->b
-testdata/Prelude.lc 137:75-137:90  {a} -> V1->a
-testdata/Prelude.lc 137:75-137:125  V0 -> HList ('Cons V17 ('map RecItem Type 'recItemType V10))
-testdata/Prelude.lc 137:75-137:128  HList ('Cons V13 ('map RecItem Type 'recItemType V6))
+testdata/Prelude.lc 137:75-137:90  {a} -> b_->a
+testdata/Prelude.lc 137:75-137:125  a_ -> HList ('Cons r_ ('map RecItem Type 'recItemType k_))
+testdata/Prelude.lc 137:75-137:128  HList ('Cons n_ ('map RecItem Type 'recItemType g_))
 testdata/Prelude.lc 137:93-137:98  List Type -> Type
 testdata/Prelude.lc 137:93-137:124  Type
 testdata/Prelude.lc 137:101-137:102  Type
@@ -534,18 +534,18 @@ testdata/Prelude.lc 137:105-137:120  List RecItem -> List Type
 testdata/Prelude.lc 137:105-137:123  List Type
 testdata/Prelude.lc 137:109-137:120  RecItem->Type
 testdata/Prelude.lc 137:121-137:123  List RecItem
-testdata/Prelude.lc 137:126-137:128  HList ('map RecItem Type 'recItemType V3)
+testdata/Prelude.lc 137:126-137:128  HList ('map RecItem Type 'recItemType d_)
 testdata/Prelude.lc 138:57-138:64  {a} -> {b : List RecItem} -> c:String -> {_ : 'isKeyC c a b} -> RecordC b -> a
-testdata/Prelude.lc 138:57-138:67  {a : List RecItem} -> b:String -> {_ : 'isKeyC b V17 a} -> RecordC a -> V19
-testdata/Prelude.lc 138:57-138:71  a:String -> {_ : 'isKeyC a V15 V8} -> RecordC V9 -> V17
-testdata/Prelude.lc 138:57-138:73  {_ : 'isKeyC V12 V14 V7} -> RecordC V8 -> V16
-testdata/Prelude.lc 138:57-138:103  RecordC V7 -> V15
-testdata/Prelude.lc 138:57-138:181  V13
+testdata/Prelude.lc 138:57-138:67  {a : List RecItem} -> b:String -> {_ : 'isKeyC b r_ a} -> RecordC a -> t_
+testdata/Prelude.lc 138:57-138:71  a:String -> {_ : 'isKeyC a p_ i_} -> RecordC j_ -> r_
+testdata/Prelude.lc 138:57-138:73  {_ : 'isKeyC m_ o_ h_} -> RecordC i_ -> q_
+testdata/Prelude.lc 138:57-138:103  RecordC h_ -> p_
+testdata/Prelude.lc 138:57-138:181  n_
 testdata/Prelude.lc 138:66-138:67  Type
-testdata/Prelude.lc 138:69-138:71  List V10
+testdata/Prelude.lc 138:69-138:71  List k_
 testdata/Prelude.lc 138:72-138:73  String
 testdata/Prelude.lc 138:76-138:85  {a}->a
-testdata/Prelude.lc 138:76-138:102  'isKeyC V12 V14 V7
+testdata/Prelude.lc 138:76-138:102  'isKeyC m_ o_ h_
 testdata/Prelude.lc 138:88-138:94  String -> Type -> List RecItem -> Type
 testdata/Prelude.lc 138:88-138:96  Type -> List RecItem -> Type
 testdata/Prelude.lc 138:88-138:98  List RecItem -> Type
@@ -554,13 +554,13 @@ testdata/Prelude.lc 138:95-138:96  String
 testdata/Prelude.lc 138:97-138:98  Type
 testdata/Prelude.lc 138:99-138:101  List RecItem
 testdata/Prelude.lc 138:105-138:115  {a : List RecItem} -> HList ('map RecItem Type 'recItemType a) -> RecordC a
-testdata/Prelude.lc 138:105-138:180  RecordC V1
+testdata/Prelude.lc 138:105-138:180  RecordC b_
 testdata/Prelude.lc 138:117-138:123  {a} -> {b : List Type} -> HList ('Cons a b) -> HList b
-testdata/Prelude.lc 138:117-138:179  HList ('map RecItem Type 'recItemType V7)
+testdata/Prelude.lc 138:117-138:179  HList ('map RecItem Type 'recItemType h_)
 testdata/Prelude.lc 138:125-138:137  {a} -> {b} -> a->b
-testdata/Prelude.lc 138:125-138:140  {a} -> V1->a
-testdata/Prelude.lc 138:125-138:175  V0 -> HList ('Cons V18 ('map RecItem Type 'recItemType V11))
-testdata/Prelude.lc 138:125-138:178  HList ('Cons V14 ('map RecItem Type 'recItemType V7))
+testdata/Prelude.lc 138:125-138:140  {a} -> b_->a
+testdata/Prelude.lc 138:125-138:175  a_ -> HList ('Cons s_ ('map RecItem Type 'recItemType l_))
+testdata/Prelude.lc 138:125-138:178  HList ('Cons o_ ('map RecItem Type 'recItemType h_))
 testdata/Prelude.lc 138:143-138:148  List Type -> Type
 testdata/Prelude.lc 138:143-138:174  Type
 testdata/Prelude.lc 138:151-138:152  Type
@@ -572,16 +572,16 @@ testdata/Prelude.lc 138:155-138:170  List RecItem -> List Type
 testdata/Prelude.lc 138:155-138:173  List Type
 testdata/Prelude.lc 138:159-138:170  RecItem->Type
 testdata/Prelude.lc 138:171-138:173  List RecItem
-testdata/Prelude.lc 138:176-138:178  HList ('map RecItem Type 'recItemType V4)
+testdata/Prelude.lc 138:176-138:178  HList ('map RecItem Type 'recItemType e_)
 testdata/Prelude.lc 142:1-142:4  Float -> Float -> Float -> VecS Float 4
 testdata/Prelude.lc 142:13-142:15  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 142:13-142:17  V5 -> V6 -> V7 -> VecS V8 4
-testdata/Prelude.lc 142:13-142:19  V4 -> V5 -> VecS V6 4
-testdata/Prelude.lc 142:13-142:21  V3 -> VecS V4 4
+testdata/Prelude.lc 142:13-142:17  f_ -> g_ -> h_ -> VecS i_ 4
+testdata/Prelude.lc 142:13-142:19  e_ -> f_ -> VecS g_ 4
+testdata/Prelude.lc 142:13-142:21  d_ -> VecS e_ 4
 testdata/Prelude.lc 142:13-142:25  VecS Float 4
-testdata/Prelude.lc 142:16-142:17  V6
-testdata/Prelude.lc 142:18-142:19  V3
-testdata/Prelude.lc 142:20-142:21  V1
+testdata/Prelude.lc 142:16-142:17  g_
+testdata/Prelude.lc 142:18-142:19  d_
+testdata/Prelude.lc 142:20-142:21  b_
 testdata/Prelude.lc 142:22-142:25  Float
 testdata/Prelude.lc 144:1-144:6  VecS Float 4
 testdata/Prelude.lc 144:11-144:14  Float -> Float -> Float -> VecS Float 4
@@ -714,24 +714,24 @@ testdata/Prelude.lc 159:23-159:26  Float
 testdata/Prelude.lc 161:1-161:12  {a:Nat} -> {b} -> {c} -> {_ : Num b} -> {_ : c ~ VecScalar a b} -> c -> Image 1 ('Color c)
 testdata/Prelude.lc 161:15-161:25  {a:Nat} -> {b:Nat} -> {c} -> {d} -> {_ : Num c} -> {_ : d ~ VecScalar b c} -> d -> Image a ('Color d)
 testdata/Prelude.lc 161:15-161:28  {a:Nat} -> {b} -> {c} -> {_ : Num b} -> {_ : c ~ VecScalar a b} -> c -> Image 1 ('Color c)
-testdata/Prelude.lc 161:27-161:28  V1
+testdata/Prelude.lc 161:27-161:28  b_
 testdata/Prelude.lc 162:1-162:12  {a:Nat} -> {b} -> {c} -> {_ : Num b} -> {_ : c ~ VecScalar a b} -> c -> Image 2 ('Color c)
 testdata/Prelude.lc 162:15-162:25  {a:Nat} -> {b:Nat} -> {c} -> {d} -> {_ : Num c} -> {_ : d ~ VecScalar b c} -> d -> Image a ('Color d)
 testdata/Prelude.lc 162:15-162:28  {a:Nat} -> {b} -> {c} -> {_ : Num b} -> {_ : c ~ VecScalar a b} -> c -> Image 2 ('Color c)
-testdata/Prelude.lc 162:27-162:28  V1
+testdata/Prelude.lc 162:27-162:28  b_
 testdata/Prelude.lc 164:1-164:12  Float -> Image 1 'Depth
 testdata/Prelude.lc 164:15-164:25  {a:Nat} -> Float -> Image a 'Depth
 testdata/Prelude.lc 164:15-164:28  Float -> Image 1 'Depth
-testdata/Prelude.lc 164:27-164:28  V1
+testdata/Prelude.lc 164:27-164:28  b_
 testdata/Prelude.lc 166:13-166:16  Nat -> Type->Type
 testdata/Prelude.lc 166:13-166:18  Type->Type
 testdata/Prelude.lc 166:13-166:24  Type
-testdata/Prelude.lc 166:17-166:18  V1
+testdata/Prelude.lc 166:17-166:18  b_
 testdata/Prelude.lc 166:19-166:24  Type
 testdata/Prelude.lc 166:28-166:31  Nat -> Type->Type
 testdata/Prelude.lc 166:28-166:33  Type->Type
 testdata/Prelude.lc 166:28-166:39  Type
-testdata/Prelude.lc 166:32-166:33  V1
+testdata/Prelude.lc 166:32-166:33  b_
 testdata/Prelude.lc 166:34-166:39  Type
 testdata/Prelude.lc 167:1-167:9  Vec 3 Float -> VecS Float 4
 testdata/Prelude.lc 167:14-167:16  {a} -> a -> a -> a -> a -> VecS a 4
@@ -745,7 +745,7 @@ testdata/Prelude.lc 167:21-167:22  Vec 3 Float
 testdata/Prelude.lc 167:21-167:24  Float
 testdata/Prelude.lc 167:25-167:26  Vec 3 Float
 testdata/Prelude.lc 167:25-167:28  Float
-testdata/Prelude.lc 167:29-167:30  V1
+testdata/Prelude.lc 167:29-167:30  b_
 testdata/Prelude.lc 174:1-174:8  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
 testdata/Prelude.lc 174:11-174:22  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
 testdata/Prelude.lc 175:1-175:8  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
@@ -906,142 +906,142 @@ testdata/Prelude.lc 263:1-263:16  {a:Nat} -> VecScalar a Word -> VecScalar a Flo
 testdata/Prelude.lc 263:19-263:38  {a:Nat} -> VecScalar a Word -> VecScalar a Float
 testdata/Prelude.lc 281:3-281:4  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
 testdata/Prelude.lc 281:9-281:16  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
-testdata/Prelude.lc 281:9-281:18  V4->V5
-testdata/Prelude.lc 281:9-281:20  V3
-testdata/Prelude.lc 281:17-281:18  V5
-testdata/Prelude.lc 281:19-281:20  V2
+testdata/Prelude.lc 281:9-281:18  e_->f_
+testdata/Prelude.lc 281:9-281:20  d_
+testdata/Prelude.lc 281:17-281:18  f_
+testdata/Prelude.lc 281:19-281:20  c_
 testdata/Prelude.lc 282:3-282:4  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
 testdata/Prelude.lc 282:9-282:16  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
-testdata/Prelude.lc 282:9-282:18  V4->V5
-testdata/Prelude.lc 282:9-282:20  V3
-testdata/Prelude.lc 282:17-282:18  V5
-testdata/Prelude.lc 282:19-282:20  V2
+testdata/Prelude.lc 282:9-282:18  e_->f_
+testdata/Prelude.lc 282:9-282:20  d_
+testdata/Prelude.lc 282:17-282:18  f_
+testdata/Prelude.lc 282:19-282:20  c_
 testdata/Prelude.lc 283:3-283:4  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
 testdata/Prelude.lc 283:9-283:16  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
-testdata/Prelude.lc 283:9-283:18  V4->V5
-testdata/Prelude.lc 283:9-283:20  V3
-testdata/Prelude.lc 283:17-283:18  V5
-testdata/Prelude.lc 283:19-283:20  V2
+testdata/Prelude.lc 283:9-283:18  e_->f_
+testdata/Prelude.lc 283:9-283:20  d_
+testdata/Prelude.lc 283:17-283:18  f_
+testdata/Prelude.lc 283:19-283:20  c_
 testdata/Prelude.lc 284:3-284:4  {a} -> {b:Nat} -> {_ : Num a} -> VecScalar b a -> VecScalar b a -> VecScalar b a
 testdata/Prelude.lc 284:9-284:16  {a} -> {b} -> {c:Nat} -> {_ : Num a} -> {_ : b ~ VecScalar c a} -> b -> b->b
-testdata/Prelude.lc 284:9-284:18  VecScalar V1 V2 -> VecScalar V2 V3
-testdata/Prelude.lc 284:9-284:20  VecScalar V1 V2
-testdata/Prelude.lc 284:17-284:18  V6
-testdata/Prelude.lc 284:19-284:20  V4
+testdata/Prelude.lc 284:9-284:18  VecScalar b_ c_ -> VecScalar c_ d_
+testdata/Prelude.lc 284:9-284:20  VecScalar b_ c_
+testdata/Prelude.lc 284:17-284:18  g_
+testdata/Prelude.lc 284:19-284:20  e_
 testdata/Prelude.lc 285:3-285:4  {a} -> {b:Nat} -> {_ : Num a} -> VecScalar b a -> VecScalar b a -> VecScalar b a
 testdata/Prelude.lc 285:9-285:16  {a} -> {b} -> {c:Nat} -> {_ : Num a} -> {_ : b ~ VecScalar c a} -> b -> b->b
-testdata/Prelude.lc 285:9-285:18  VecScalar V1 V2 -> VecScalar V2 V3
-testdata/Prelude.lc 285:9-285:20  VecScalar V1 V2
-testdata/Prelude.lc 285:17-285:18  V6
-testdata/Prelude.lc 285:19-285:20  V4
+testdata/Prelude.lc 285:9-285:18  VecScalar b_ c_ -> VecScalar c_ d_
+testdata/Prelude.lc 285:9-285:20  VecScalar b_ c_
+testdata/Prelude.lc 285:17-285:18  g_
+testdata/Prelude.lc 285:19-285:20  e_
 testdata/Prelude.lc 287:1-287:4  {a} -> {_ : Signed (MatVecScalarElem a)} -> a->a
 testdata/Prelude.lc 287:9-287:16  {a} -> {_ : Signed (MatVecScalarElem a)} -> a->a
-testdata/Prelude.lc 287:9-287:18  V2
-testdata/Prelude.lc 287:17-287:18  V3
+testdata/Prelude.lc 287:9-287:18  c_
+testdata/Prelude.lc 287:17-287:18  d_
 testdata/Prelude.lc 291:3-291:5  {a} -> a -> a->Bool
 testdata/Prelude.lc 291:10-291:22  {a} -> {b} -> {_ : b ~ MatVecScalarElem a} -> a -> a->Bool
-testdata/Prelude.lc 291:10-291:24  V3->Bool
+testdata/Prelude.lc 291:10-291:24  d_->Bool
 testdata/Prelude.lc 291:10-291:26  Bool
-testdata/Prelude.lc 291:23-291:24  V4
-testdata/Prelude.lc 291:25-291:26  V1
+testdata/Prelude.lc 291:23-291:24  e_
+testdata/Prelude.lc 291:25-291:26  b_
 testdata/Prelude.lc 292:3-292:4  {a:Nat} -> {b} -> {_ : Num b} -> VecScalar a b -> VecScalar a b -> VecScalar a Bool
 testdata/Prelude.lc 292:9-292:21  {a} -> {b:Nat} -> {c} -> {d} -> {_ : Num c} -> {_ : a ~ VecScalar b c} -> {_ : d ~ VecScalar b Bool} -> a -> a->d
-testdata/Prelude.lc 292:9-292:23  VecScalar V2 V1 -> VecScalar V3 Bool
-testdata/Prelude.lc 292:9-292:25  VecScalar V2 Bool
-testdata/Prelude.lc 292:22-292:23  V6
-testdata/Prelude.lc 292:24-292:25  V4
+testdata/Prelude.lc 292:9-292:23  VecScalar c_ b_ -> VecScalar d_ Bool
+testdata/Prelude.lc 292:9-292:25  VecScalar c_ Bool
+testdata/Prelude.lc 292:22-292:23  g_
+testdata/Prelude.lc 292:24-292:25  e_
 testdata/Prelude.lc 293:3-293:5  {a:Nat} -> {b} -> {_ : Num b} -> VecScalar a b -> VecScalar a b -> VecScalar a Bool
 testdata/Prelude.lc 293:10-293:27  {a} -> {b:Nat} -> {c} -> {d} -> {_ : Num c} -> {_ : a ~ VecScalar b c} -> {_ : d ~ VecScalar b Bool} -> a -> a->d
-testdata/Prelude.lc 293:10-293:29  VecScalar V2 V1 -> VecScalar V3 Bool
-testdata/Prelude.lc 293:10-293:31  VecScalar V2 Bool
-testdata/Prelude.lc 293:28-293:29  V6
-testdata/Prelude.lc 293:30-293:31  V4
+testdata/Prelude.lc 293:10-293:29  VecScalar c_ b_ -> VecScalar d_ Bool
+testdata/Prelude.lc 293:10-293:31  VecScalar c_ Bool
+testdata/Prelude.lc 293:28-293:29  g_
+testdata/Prelude.lc 293:30-293:31  e_
 testdata/Prelude.lc 294:3-294:5  {a:Nat} -> {b} -> {_ : Num b} -> VecScalar a b -> VecScalar a b -> VecScalar a Bool
 testdata/Prelude.lc 294:10-294:30  {a} -> {b:Nat} -> {c} -> {d} -> {_ : Num c} -> {_ : a ~ VecScalar b c} -> {_ : d ~ VecScalar b Bool} -> a -> a->d
-testdata/Prelude.lc 294:10-294:32  VecScalar V2 V1 -> VecScalar V3 Bool
-testdata/Prelude.lc 294:10-294:34  VecScalar V2 Bool
-testdata/Prelude.lc 294:31-294:32  V6
-testdata/Prelude.lc 294:33-294:34  V4
+testdata/Prelude.lc 294:10-294:32  VecScalar c_ b_ -> VecScalar d_ Bool
+testdata/Prelude.lc 294:10-294:34  VecScalar c_ Bool
+testdata/Prelude.lc 294:31-294:32  g_
+testdata/Prelude.lc 294:33-294:34  e_
 testdata/Prelude.lc 295:3-295:4  {a:Nat} -> {b} -> {_ : Num b} -> VecScalar a b -> VecScalar a b -> VecScalar a Bool
 testdata/Prelude.lc 295:9-295:24  {a} -> {b:Nat} -> {c} -> {d} -> {_ : Num c} -> {_ : a ~ VecScalar b c} -> {_ : d ~ VecScalar b Bool} -> a -> a->d
-testdata/Prelude.lc 295:9-295:26  VecScalar V2 V1 -> VecScalar V3 Bool
-testdata/Prelude.lc 295:9-295:28  VecScalar V2 Bool
-testdata/Prelude.lc 295:25-295:26  V6
-testdata/Prelude.lc 295:27-295:28  V4
+testdata/Prelude.lc 295:9-295:26  VecScalar c_ b_ -> VecScalar d_ Bool
+testdata/Prelude.lc 295:9-295:28  VecScalar c_ Bool
+testdata/Prelude.lc 295:25-295:26  g_
+testdata/Prelude.lc 295:27-295:28  e_
 testdata/Prelude.lc 298:3-298:5  Bool -> Bool->Bool
 testdata/Prelude.lc 298:10-298:17  Bool -> Bool->Bool
 testdata/Prelude.lc 298:10-298:19  Bool->Bool
 testdata/Prelude.lc 298:10-298:21  Bool
-testdata/Prelude.lc 298:18-298:19  V3
-testdata/Prelude.lc 298:20-298:21  V1
+testdata/Prelude.lc 298:18-298:19  d_
+testdata/Prelude.lc 298:20-298:21  b_
 testdata/Prelude.lc 299:3-299:5  Bool -> Bool->Bool
 testdata/Prelude.lc 299:10-299:16  Bool -> Bool->Bool
 testdata/Prelude.lc 299:10-299:18  Bool->Bool
 testdata/Prelude.lc 299:10-299:20  Bool
-testdata/Prelude.lc 299:17-299:18  V3
-testdata/Prelude.lc 299:19-299:20  V1
+testdata/Prelude.lc 299:17-299:18  d_
+testdata/Prelude.lc 299:19-299:20  b_
 testdata/Prelude.lc 300:1-300:4  Bool -> Bool->Bool
 testdata/Prelude.lc 300:7-300:14  Bool -> Bool->Bool
 testdata/Prelude.lc 301:1-301:4  {a:Nat} -> VecScalar a Bool -> VecScalar a Bool
 testdata/Prelude.lc 301:9-301:16  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Bool} -> a->a
-testdata/Prelude.lc 301:9-301:18  VecScalar V0 Bool
-testdata/Prelude.lc 301:17-301:18  V2
+testdata/Prelude.lc 301:9-301:18  VecScalar a_ Bool
+testdata/Prelude.lc 301:17-301:18  c_
 testdata/Prelude.lc 302:1-302:4  {a:Nat} -> VecScalar a Bool -> Bool
 testdata/Prelude.lc 302:9-302:16  {a:Nat} -> VecScalar a Bool -> Bool
 testdata/Prelude.lc 302:9-302:18  Bool
-testdata/Prelude.lc 302:17-302:18  V2
+testdata/Prelude.lc 302:17-302:18  c_
 testdata/Prelude.lc 303:1-303:4  {a:Nat} -> VecScalar a Bool -> Bool
 testdata/Prelude.lc 303:9-303:16  {a:Nat} -> VecScalar a Bool -> Bool
 testdata/Prelude.lc 303:9-303:18  Bool
-testdata/Prelude.lc 303:17-303:18  V2
+testdata/Prelude.lc 303:17-303:18  c_
 testdata/Prelude.lc 306:3-306:6  {a:Nat} -> {b:Nat} -> {c} -> {d:Nat} -> Mat a b c -> Mat b d c -> Mat a d c
 testdata/Prelude.lc 306:11-306:24  {a:Nat} -> {b:Nat} -> {c} -> {d:Nat} -> Mat a b c -> Mat b d c -> Mat a d c
-testdata/Prelude.lc 306:11-306:26  Mat V2 V0 V1 -> Mat V4 V1 V2
-testdata/Prelude.lc 306:11-306:28  Mat V3 V0 V1
-testdata/Prelude.lc 306:25-306:26  V7
-testdata/Prelude.lc 306:27-306:28  V5
+testdata/Prelude.lc 306:11-306:26  Mat c_ a_ b_ -> Mat e_ b_ c_
+testdata/Prelude.lc 306:11-306:28  Mat d_ a_ b_
+testdata/Prelude.lc 306:25-306:26  h_
+testdata/Prelude.lc 306:27-306:28  f_
 testdata/Prelude.lc 307:3-307:5  {a:Nat} -> {b:Nat} -> {c} -> Mat a b c -> VecS c b -> Vec a c
 testdata/Prelude.lc 307:10-307:23  {a:Nat} -> {b:Nat} -> {c} -> Mat a b c -> Vec b c -> Vec a c
-testdata/Prelude.lc 307:10-307:25  Vec V1 V0 -> Vec V3 V1
-testdata/Prelude.lc 307:10-307:27  Vec V2 V0
-testdata/Prelude.lc 307:24-307:25  V6
-testdata/Prelude.lc 307:26-307:27  V4
+testdata/Prelude.lc 307:10-307:25  Vec b_ a_ -> Vec d_ b_
+testdata/Prelude.lc 307:10-307:27  Vec c_ a_
+testdata/Prelude.lc 307:24-307:25  g_
+testdata/Prelude.lc 307:26-307:27  e_
 testdata/Prelude.lc 308:3-308:5  {a:Nat} -> {b} -> {c:Nat} -> VecS b a -> Mat a c b -> Vec c b
 testdata/Prelude.lc 308:10-308:23  {a:Nat} -> {b} -> {c:Nat} -> Vec a b -> Mat a c b -> Vec c b
-testdata/Prelude.lc 308:10-308:25  Mat V2 V0 V1 -> Vec V1 V2
-testdata/Prelude.lc 308:10-308:27  Vec V0 V1
-testdata/Prelude.lc 308:24-308:25  V6
-testdata/Prelude.lc 308:26-308:27  V4
+testdata/Prelude.lc 308:10-308:25  Mat c_ a_ b_ -> Vec b_ c_
+testdata/Prelude.lc 308:10-308:27  Vec a_ b_
+testdata/Prelude.lc 308:24-308:25  g_
+testdata/Prelude.lc 308:26-308:27  e_
 testdata/Prelude.lc 315:3-315:5  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> MatVecScalarElem a -> a
 testdata/Prelude.lc 315:10-315:18  {a} -> {b} -> {_ : a ~ MatVecScalarElem b} -> {_ : Num a} -> b -> a->b
-testdata/Prelude.lc 315:10-315:20  MatVecScalarElem V4 -> V5
-testdata/Prelude.lc 315:10-315:22  V3
-testdata/Prelude.lc 315:19-315:20  V5
-testdata/Prelude.lc 315:21-315:22  V2
+testdata/Prelude.lc 315:10-315:20  MatVecScalarElem e_ -> f_
+testdata/Prelude.lc 315:10-315:22  d_
+testdata/Prelude.lc 315:19-315:20  f_
+testdata/Prelude.lc 315:21-315:22  c_
 testdata/Prelude.lc 316:3-316:5  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> MatVecScalarElem a -> a
 testdata/Prelude.lc 316:10-316:18  {a} -> {b} -> {_ : a ~ MatVecScalarElem b} -> {_ : Num a} -> b -> a->b
-testdata/Prelude.lc 316:10-316:20  MatVecScalarElem V4 -> V5
-testdata/Prelude.lc 316:10-316:22  V3
-testdata/Prelude.lc 316:19-316:20  V5
-testdata/Prelude.lc 316:21-316:22  V2
+testdata/Prelude.lc 316:10-316:20  MatVecScalarElem e_ -> f_
+testdata/Prelude.lc 316:10-316:22  d_
+testdata/Prelude.lc 316:19-316:20  f_
+testdata/Prelude.lc 316:21-316:22  c_
 testdata/Prelude.lc 317:3-317:5  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> MatVecScalarElem a -> a
 testdata/Prelude.lc 317:10-317:18  {a} -> {b} -> {_ : a ~ MatVecScalarElem b} -> {_ : Num a} -> b -> a->b
-testdata/Prelude.lc 317:10-317:20  MatVecScalarElem V4 -> V5
-testdata/Prelude.lc 317:10-317:22  V3
-testdata/Prelude.lc 317:19-317:20  V5
-testdata/Prelude.lc 317:21-317:22  V2
+testdata/Prelude.lc 317:10-317:20  MatVecScalarElem e_ -> f_
+testdata/Prelude.lc 317:10-317:22  d_
+testdata/Prelude.lc 317:19-317:20  f_
+testdata/Prelude.lc 317:21-317:22  c_
 testdata/Prelude.lc 318:3-318:5  {a} -> {b:Nat} -> {_ : Num a} -> VecScalar b a -> a -> VecScalar b a
 testdata/Prelude.lc 318:10-318:18  {a} -> {b} -> {c:Nat} -> {_ : Num a} -> {_ : b ~ VecScalar c a} -> b -> a->b
-testdata/Prelude.lc 318:10-318:20  V2 -> VecScalar V2 V3
-testdata/Prelude.lc 318:10-318:22  VecScalar V1 V3
-testdata/Prelude.lc 318:19-318:20  V6
-testdata/Prelude.lc 318:21-318:22  V4
+testdata/Prelude.lc 318:10-318:20  c_ -> VecScalar c_ d_
+testdata/Prelude.lc 318:10-318:22  VecScalar b_ d_
+testdata/Prelude.lc 318:19-318:20  g_
+testdata/Prelude.lc 318:21-318:22  e_
 testdata/Prelude.lc 319:3-319:5  {a} -> {b:Nat} -> {_ : Num a} -> VecScalar b a -> a -> VecScalar b a
 testdata/Prelude.lc 319:10-319:18  {a} -> {b} -> {c:Nat} -> {_ : Num a} -> {_ : b ~ VecScalar c a} -> b -> a->b
-testdata/Prelude.lc 319:10-319:20  V2 -> VecScalar V2 V3
-testdata/Prelude.lc 319:10-319:22  VecScalar V1 V3
-testdata/Prelude.lc 319:19-319:20  V6
-testdata/Prelude.lc 319:21-319:22  V4
+testdata/Prelude.lc 319:10-319:20  c_ -> VecScalar c_ d_
+testdata/Prelude.lc 319:10-319:22  VecScalar b_ d_
+testdata/Prelude.lc 319:19-319:20  g_
+testdata/Prelude.lc 319:21-319:22  e_
 testdata/Prelude.lc 326:16-326:21  Type
 testdata/Prelude.lc 327:16-327:21  Type
 testdata/Prelude.lc 327:16-330:29  Type
@@ -1053,8 +1053,8 @@ testdata/Prelude.lc 330:16-330:19  Nat -> Nat -> Type->Type
 testdata/Prelude.lc 330:16-330:21  Nat -> Type->Type
 testdata/Prelude.lc 330:16-330:23  Type->Type
 testdata/Prelude.lc 330:16-330:29  Type
-testdata/Prelude.lc 330:20-330:21  V1
-testdata/Prelude.lc 330:22-330:23  V1
+testdata/Prelude.lc 330:20-330:21  b_
+testdata/Prelude.lc 330:22-330:23  b_
 testdata/Prelude.lc 330:24-330:29  Type
 testdata/Prelude.lc 331:1-331:12  Float -> Float -> Float -> Float -> Mat 4 4 Float
 testdata/Prelude.lc 332:5-332:9  Vec 4 Float -> Vec 4 Float -> Vec 4 Float -> Vec 4 Float -> Mat 4 4 Float
@@ -1068,8 +1068,8 @@ testdata/Prelude.lc 332:11-332:25  Float -> Float -> Float -> VecS Float 4
 testdata/Prelude.lc 332:11-332:29  Float -> Float -> VecS Float 4
 testdata/Prelude.lc 332:11-332:43  Float -> VecS Float 4
 testdata/Prelude.lc 332:11-332:58  VecS Float 4
-testdata/Prelude.lc 332:15-332:16  V1
-testdata/Prelude.lc 332:15-332:17  V2->V3
+testdata/Prelude.lc 332:15-332:16  b_
+testdata/Prelude.lc 332:15-332:17  c_->d_
 testdata/Prelude.lc 332:15-332:18  VecScalar 1 Float
 testdata/Prelude.lc 332:15-332:19  VecScalar 1 Float -> VecScalar 1 Float
 testdata/Prelude.lc 332:15-332:24  VecScalar 1 Float
@@ -1081,17 +1081,17 @@ testdata/Prelude.lc 332:20-332:22  Float->Float
 testdata/Prelude.lc 332:20-332:23  Float
 testdata/Prelude.lc 332:21-332:22  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
 testdata/Prelude.lc 332:22-332:23  Float
-testdata/Prelude.lc 332:28-332:29  V1
-testdata/Prelude.lc 332:42-332:43  V1
-testdata/Prelude.lc 332:57-332:58  V1
+testdata/Prelude.lc 332:28-332:29  b_
+testdata/Prelude.lc 332:42-332:43  b_
+testdata/Prelude.lc 332:57-332:58  b_
 testdata/Prelude.lc 333:11-333:13  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 333:11-333:15  V1 -> V2 -> V3 -> VecS V4 4
+testdata/Prelude.lc 333:11-333:15  b_ -> c_ -> d_ -> VecS e_ 4
 testdata/Prelude.lc 333:11-333:39  Float -> Float -> VecS Float 4
 testdata/Prelude.lc 333:11-333:43  Float -> VecS Float 4
 testdata/Prelude.lc 333:11-333:58  VecS Float 4
-testdata/Prelude.lc 333:14-333:15  V1
-testdata/Prelude.lc 333:29-333:30  V1
-testdata/Prelude.lc 333:29-333:31  V2->V3
+testdata/Prelude.lc 333:14-333:15  b_
+testdata/Prelude.lc 333:29-333:30  b_
+testdata/Prelude.lc 333:29-333:31  c_->d_
 testdata/Prelude.lc 333:29-333:32  VecScalar 1 Float
 testdata/Prelude.lc 333:29-333:33  VecScalar 1 Float -> VecScalar 1 Float
 testdata/Prelude.lc 333:29-333:38  VecScalar 1 Float
@@ -1103,8 +1103,8 @@ testdata/Prelude.lc 333:34-333:36  Float->Float
 testdata/Prelude.lc 333:34-333:37  Float
 testdata/Prelude.lc 333:35-333:36  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
 testdata/Prelude.lc 333:36-333:37  Float
-testdata/Prelude.lc 333:42-333:43  V1
-testdata/Prelude.lc 333:57-333:58  V1
+testdata/Prelude.lc 333:42-333:43  b_
+testdata/Prelude.lc 333:57-333:58  b_
 testdata/Prelude.lc 334:11-334:13  {a} -> a -> a -> a -> a -> VecS a 4
 testdata/Prelude.lc 334:11-334:27  Float -> Float -> Float -> VecS Float 4
 testdata/Prelude.lc 334:11-334:41  Float -> Float -> VecS Float 4
@@ -1153,18 +1153,18 @@ testdata/Prelude.lc 334:52-334:53  {a} -> {_ : Num (MatVecScalarElem a)} -> a ->
 testdata/Prelude.lc 334:53-334:54  Float
 testdata/Prelude.lc 334:58-334:59  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
 testdata/Prelude.lc 334:58-334:60  Float
-testdata/Prelude.lc 334:59-334:60  V1
+testdata/Prelude.lc 334:59-334:60  b_
 testdata/Prelude.lc 335:11-335:13  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 335:11-335:15  V1 -> V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 335:11-335:29  V2 -> V3 -> VecS V4 4
+testdata/Prelude.lc 335:11-335:15  b_ -> c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 335:11-335:29  c_ -> d_ -> VecS e_ 4
 testdata/Prelude.lc 335:11-335:56  Float -> VecS Float 4
 testdata/Prelude.lc 335:11-335:58  VecS Float 4
-testdata/Prelude.lc 335:14-335:15  V1
-testdata/Prelude.lc 335:28-335:29  V1
+testdata/Prelude.lc 335:14-335:15  b_
+testdata/Prelude.lc 335:28-335:29  b_
 testdata/Prelude.lc 335:43-335:44  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
 testdata/Prelude.lc 335:43-335:55  Float
-testdata/Prelude.lc 335:44-335:45  V1
-testdata/Prelude.lc 335:44-335:46  V2->V3
+testdata/Prelude.lc 335:44-335:45  b_
+testdata/Prelude.lc 335:44-335:46  c_->d_
 testdata/Prelude.lc 335:44-335:47  Float
 testdata/Prelude.lc 335:44-335:48  Float->Float
 testdata/Prelude.lc 335:44-335:49  Float
@@ -1180,7 +1180,7 @@ testdata/Prelude.lc 335:51-335:53  Float->Float
 testdata/Prelude.lc 335:51-335:54  Float
 testdata/Prelude.lc 335:52-335:53  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
 testdata/Prelude.lc 335:53-335:54  Float
-testdata/Prelude.lc 335:57-335:58  V1
+testdata/Prelude.lc 335:57-335:58  b_
 testdata/Prelude.lc 337:9-337:10  Float
 testdata/Prelude.lc 337:9-337:11  Float->Float
 testdata/Prelude.lc 337:9-337:22  Float
@@ -1191,7 +1191,7 @@ testdata/Prelude.lc 337:15-337:19  Float
 testdata/Prelude.lc 337:15-337:20  VecScalar 1 Float -> VecScalar 1 Float
 testdata/Prelude.lc 337:15-337:21  VecScalar 1 Float
 testdata/Prelude.lc 337:19-337:20  {a} -> {b:Nat} -> {_ : Num a} -> VecScalar b a -> VecScalar b a -> VecScalar b a
-testdata/Prelude.lc 337:20-337:21  V1
+testdata/Prelude.lc 337:20-337:21  b_
 testdata/Prelude.lc 338:9-338:10  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
 testdata/Prelude.lc 338:9-338:11  Float
 testdata/Prelude.lc 338:10-338:11  Float
@@ -1210,14 +1210,14 @@ testdata/Prelude.lc 342:16-342:49  Vec 4 Float -> Vec 4 Float -> Mat 4 4 Float
 testdata/Prelude.lc 342:16-342:62  Vec 4 Float -> Mat 4 4 Float
 testdata/Prelude.lc 342:16-342:75  Mat 4 4 Float
 testdata/Prelude.lc 342:22-342:24  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 342:22-342:26  VecScalar V2 Float -> VecScalar V3 Float -> VecScalar V4 Float -> VecS (VecScalar V5 Float) 4
-testdata/Prelude.lc 342:22-342:28  VecScalar V2 Float -> VecScalar V3 Float -> VecS (VecScalar V4 Float) 4
-testdata/Prelude.lc 342:22-342:30  VecScalar V3 Float -> VecS (VecScalar V4 Float) 4
+testdata/Prelude.lc 342:22-342:26  VecScalar c_ Float -> VecScalar d_ Float -> VecScalar e_ Float -> VecS (VecScalar f_ Float) 4
+testdata/Prelude.lc 342:22-342:28  VecScalar c_ Float -> VecScalar d_ Float -> VecS (VecScalar e_ Float) 4
+testdata/Prelude.lc 342:22-342:30  VecScalar d_ Float -> VecS (VecScalar e_ Float) 4
 testdata/Prelude.lc 342:22-342:32  VecS (VecScalar 1 Float) 4
-testdata/Prelude.lc 342:25-342:26  VecScalar V3 Float
-testdata/Prelude.lc 342:27-342:28  VecScalar V2 Float
-testdata/Prelude.lc 342:29-342:30  V1
-testdata/Prelude.lc 342:31-342:32  V1
+testdata/Prelude.lc 342:25-342:26  VecScalar d_ Float
+testdata/Prelude.lc 342:27-342:28  VecScalar c_ Float
+testdata/Prelude.lc 342:29-342:30  b_
+testdata/Prelude.lc 342:31-342:32  b_
 testdata/Prelude.lc 342:35-342:37  {a} -> a -> a -> a -> a -> VecS a 4
 testdata/Prelude.lc 342:35-342:42  Float -> Float -> Float -> VecS Float 4
 testdata/Prelude.lc 342:35-342:44  Float -> Float -> VecS Float 4
@@ -1227,32 +1227,32 @@ testdata/Prelude.lc 342:39-342:40  {a} -> {_ : Num (MatVecScalarElem a)} -> a ->
 testdata/Prelude.lc 342:39-342:41  Float
 testdata/Prelude.lc 342:40-342:41  VecScalar 1 Float
 testdata/Prelude.lc 342:43-342:44  VecScalar 1 Float
-testdata/Prelude.lc 342:45-342:46  V1
-testdata/Prelude.lc 342:47-342:48  V1
+testdata/Prelude.lc 342:45-342:46  b_
+testdata/Prelude.lc 342:47-342:48  b_
 testdata/Prelude.lc 342:51-342:53  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 342:51-342:55  V1 -> V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 342:51-342:57  V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 342:51-342:59  V2 -> VecS V3 4
+testdata/Prelude.lc 342:51-342:55  b_ -> c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 342:51-342:57  c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 342:51-342:59  c_ -> VecS d_ 4
 testdata/Prelude.lc 342:51-342:61  VecS Float 4
-testdata/Prelude.lc 342:54-342:55  V1
-testdata/Prelude.lc 342:56-342:57  V1
-testdata/Prelude.lc 342:58-342:59  V1
-testdata/Prelude.lc 342:60-342:61  V1
+testdata/Prelude.lc 342:54-342:55  b_
+testdata/Prelude.lc 342:56-342:57  b_
+testdata/Prelude.lc 342:58-342:59  b_
+testdata/Prelude.lc 342:60-342:61  b_
 testdata/Prelude.lc 342:64-342:66  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 342:64-342:68  V1 -> V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 342:64-342:70  V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 342:64-342:72  V2 -> VecS V3 4
+testdata/Prelude.lc 342:64-342:68  b_ -> c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 342:64-342:70  c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 342:64-342:72  c_ -> VecS d_ 4
 testdata/Prelude.lc 342:64-342:74  VecS Float 4
-testdata/Prelude.lc 342:67-342:68  V1
-testdata/Prelude.lc 342:69-342:70  V1
-testdata/Prelude.lc 342:71-342:72  V1
-testdata/Prelude.lc 342:73-342:74  V1
+testdata/Prelude.lc 342:67-342:68  b_
+testdata/Prelude.lc 342:69-342:70  b_
+testdata/Prelude.lc 342:71-342:72  b_
+testdata/Prelude.lc 342:73-342:74  b_
 testdata/Prelude.lc 344:9-344:12  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
-testdata/Prelude.lc 344:9-344:14  VecScalar V0 Float
-testdata/Prelude.lc 344:13-344:14  V2
+testdata/Prelude.lc 344:9-344:14  VecScalar a_ Float
+testdata/Prelude.lc 344:13-344:14  c_
 testdata/Prelude.lc 345:9-345:12  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
-testdata/Prelude.lc 345:9-345:14  VecScalar V1 Float
-testdata/Prelude.lc 345:13-345:14  VecScalar V2 Float
+testdata/Prelude.lc 345:9-345:14  VecScalar b_ Float
+testdata/Prelude.lc 345:13-345:14  VecScalar c_ Float
 testdata/Prelude.lc 347:1-347:11  VecScalar 1 Float -> Mat 4 4 Float
 testdata/Prelude.lc 347:16-347:20  Vec 4 Float -> Vec 4 Float -> Vec 4 Float -> Vec 4 Float -> Mat 4 4 Float
 testdata/Prelude.lc 347:16-347:36  Vec 4 Float -> Vec 4 Float -> Vec 4 Float -> Mat 4 4 Float
@@ -1260,49 +1260,49 @@ testdata/Prelude.lc 347:16-347:49  Vec 4 Float -> Vec 4 Float -> Mat 4 4 Float
 testdata/Prelude.lc 347:16-347:62  Vec 4 Float -> Mat 4 4 Float
 testdata/Prelude.lc 347:16-347:75  Mat 4 4 Float
 testdata/Prelude.lc 347:22-347:24  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 347:22-347:26  VecScalar V2 Float -> VecScalar V3 Float -> VecScalar V4 Float -> VecS (VecScalar V5 Float) 4
-testdata/Prelude.lc 347:22-347:28  VecScalar V3 Float -> VecScalar V4 Float -> VecS (VecScalar V5 Float) 4
-testdata/Prelude.lc 347:22-347:33  VecScalar V5 Float -> VecS (VecScalar V6 Float) 4
+testdata/Prelude.lc 347:22-347:26  VecScalar c_ Float -> VecScalar d_ Float -> VecScalar e_ Float -> VecS (VecScalar f_ Float) 4
+testdata/Prelude.lc 347:22-347:28  VecScalar d_ Float -> VecScalar e_ Float -> VecS (VecScalar f_ Float) 4
+testdata/Prelude.lc 347:22-347:33  VecScalar f_ Float -> VecS (VecScalar g_ Float) 4
 testdata/Prelude.lc 347:22-347:35  VecS (VecScalar 1 Float) 4
-testdata/Prelude.lc 347:25-347:26  VecScalar V3 Float
-testdata/Prelude.lc 347:27-347:28  V1
+testdata/Prelude.lc 347:25-347:26  VecScalar d_ Float
+testdata/Prelude.lc 347:27-347:28  b_
 testdata/Prelude.lc 347:30-347:31  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
-testdata/Prelude.lc 347:30-347:32  VecScalar V5 Float
-testdata/Prelude.lc 347:31-347:32  VecScalar V5 Float
-testdata/Prelude.lc 347:34-347:35  V1
+testdata/Prelude.lc 347:30-347:32  VecScalar f_ Float
+testdata/Prelude.lc 347:31-347:32  VecScalar f_ Float
+testdata/Prelude.lc 347:34-347:35  b_
 testdata/Prelude.lc 347:38-347:40  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 347:38-347:42  V1 -> V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 347:38-347:44  V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 347:38-347:46  V2 -> VecS V3 4
+testdata/Prelude.lc 347:38-347:42  b_ -> c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 347:38-347:44  c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 347:38-347:46  c_ -> VecS d_ 4
 testdata/Prelude.lc 347:38-347:48  VecS Float 4
-testdata/Prelude.lc 347:41-347:42  V1
-testdata/Prelude.lc 347:43-347:44  V1
-testdata/Prelude.lc 347:45-347:46  V1
-testdata/Prelude.lc 347:47-347:48  V1
+testdata/Prelude.lc 347:41-347:42  b_
+testdata/Prelude.lc 347:43-347:44  b_
+testdata/Prelude.lc 347:45-347:46  b_
+testdata/Prelude.lc 347:47-347:48  b_
 testdata/Prelude.lc 347:51-347:53  {a} -> a -> a -> a -> a -> VecS a 4
 testdata/Prelude.lc 347:51-347:55  Float -> Float -> Float -> VecS Float 4
 testdata/Prelude.lc 347:51-347:57  Float -> Float -> VecS Float 4
 testdata/Prelude.lc 347:51-347:59  Float -> VecS Float 4
 testdata/Prelude.lc 347:51-347:61  VecS Float 4
 testdata/Prelude.lc 347:54-347:55  VecScalar 1 Float
-testdata/Prelude.lc 347:56-347:57  V1
+testdata/Prelude.lc 347:56-347:57  b_
 testdata/Prelude.lc 347:58-347:59  VecScalar 1 Float
-testdata/Prelude.lc 347:60-347:61  V1
+testdata/Prelude.lc 347:60-347:61  b_
 testdata/Prelude.lc 347:64-347:66  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 347:64-347:68  V1 -> V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 347:64-347:70  V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 347:64-347:72  V2 -> VecS V3 4
+testdata/Prelude.lc 347:64-347:68  b_ -> c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 347:64-347:70  c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 347:64-347:72  c_ -> VecS d_ 4
 testdata/Prelude.lc 347:64-347:74  VecS Float 4
-testdata/Prelude.lc 347:67-347:68  V1
-testdata/Prelude.lc 347:69-347:70  V1
-testdata/Prelude.lc 347:71-347:72  V1
-testdata/Prelude.lc 347:73-347:74  V1
+testdata/Prelude.lc 347:67-347:68  b_
+testdata/Prelude.lc 347:69-347:70  b_
+testdata/Prelude.lc 347:71-347:72  b_
+testdata/Prelude.lc 347:73-347:74  b_
 testdata/Prelude.lc 349:9-349:12  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
-testdata/Prelude.lc 349:9-349:14  VecScalar V0 Float
-testdata/Prelude.lc 349:13-349:14  V2
+testdata/Prelude.lc 349:9-349:14  VecScalar a_ Float
+testdata/Prelude.lc 349:13-349:14  c_
 testdata/Prelude.lc 350:9-350:12  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
-testdata/Prelude.lc 350:9-350:14  VecScalar V1 Float
-testdata/Prelude.lc 350:13-350:14  VecScalar V2 Float
+testdata/Prelude.lc 350:9-350:14  VecScalar b_ Float
+testdata/Prelude.lc 350:13-350:14  VecScalar c_ Float
 testdata/Prelude.lc 352:1-352:11  VecScalar 1 Float -> Mat 4 4 Float
 testdata/Prelude.lc 352:16-352:20  Vec 4 Float -> Vec 4 Float -> Vec 4 Float -> Vec 4 Float -> Mat 4 4 Float
 testdata/Prelude.lc 352:16-352:33  Vec 4 Float -> Vec 4 Float -> Vec 4 Float -> Mat 4 4 Float
@@ -1310,76 +1310,76 @@ testdata/Prelude.lc 352:16-352:46  Vec 4 Float -> Vec 4 Float -> Mat 4 4 Float
 testdata/Prelude.lc 352:16-352:62  Vec 4 Float -> Mat 4 4 Float
 testdata/Prelude.lc 352:16-352:75  Mat 4 4 Float
 testdata/Prelude.lc 352:22-352:24  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 352:22-352:26  V1 -> V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 352:22-352:28  V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 352:22-352:30  V2 -> VecS V3 4
+testdata/Prelude.lc 352:22-352:26  b_ -> c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 352:22-352:28  c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 352:22-352:30  c_ -> VecS d_ 4
 testdata/Prelude.lc 352:22-352:32  VecS Float 4
-testdata/Prelude.lc 352:25-352:26  V1
-testdata/Prelude.lc 352:27-352:28  V1
-testdata/Prelude.lc 352:29-352:30  V1
-testdata/Prelude.lc 352:31-352:32  V1
+testdata/Prelude.lc 352:25-352:26  b_
+testdata/Prelude.lc 352:27-352:28  b_
+testdata/Prelude.lc 352:29-352:30  b_
+testdata/Prelude.lc 352:31-352:32  b_
 testdata/Prelude.lc 352:35-352:37  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 352:35-352:39  V1 -> V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 352:35-352:41  VecScalar V3 Float -> VecScalar V4 Float -> VecS (VecScalar V5 Float) 4
-testdata/Prelude.lc 352:35-352:43  VecScalar V3 Float -> VecS (VecScalar V4 Float) 4
+testdata/Prelude.lc 352:35-352:39  b_ -> c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 352:35-352:41  VecScalar d_ Float -> VecScalar e_ Float -> VecS (VecScalar f_ Float) 4
+testdata/Prelude.lc 352:35-352:43  VecScalar d_ Float -> VecS (VecScalar e_ Float) 4
 testdata/Prelude.lc 352:35-352:45  VecS (VecScalar 1 Float) 4
-testdata/Prelude.lc 352:38-352:39  V1
-testdata/Prelude.lc 352:40-352:41  VecScalar V4 Float
-testdata/Prelude.lc 352:42-352:43  VecScalar V3 Float
-testdata/Prelude.lc 352:44-352:45  V1
+testdata/Prelude.lc 352:38-352:39  b_
+testdata/Prelude.lc 352:40-352:41  VecScalar e_ Float
+testdata/Prelude.lc 352:42-352:43  VecScalar d_ Float
+testdata/Prelude.lc 352:44-352:45  b_
 testdata/Prelude.lc 352:48-352:50  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 352:48-352:52  V1 -> V2 -> V3 -> VecS V4 4
+testdata/Prelude.lc 352:48-352:52  b_ -> c_ -> d_ -> VecS e_ 4
 testdata/Prelude.lc 352:48-352:57  Float -> Float -> VecS Float 4
 testdata/Prelude.lc 352:48-352:59  Float -> VecS Float 4
 testdata/Prelude.lc 352:48-352:61  VecS Float 4
-testdata/Prelude.lc 352:51-352:52  V1
+testdata/Prelude.lc 352:51-352:52  b_
 testdata/Prelude.lc 352:54-352:55  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
 testdata/Prelude.lc 352:54-352:56  Float
 testdata/Prelude.lc 352:55-352:56  VecScalar 1 Float
 testdata/Prelude.lc 352:58-352:59  VecScalar 1 Float
-testdata/Prelude.lc 352:60-352:61  V1
+testdata/Prelude.lc 352:60-352:61  b_
 testdata/Prelude.lc 352:64-352:66  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 352:64-352:68  V1 -> V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 352:64-352:70  V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 352:64-352:72  V2 -> VecS V3 4
+testdata/Prelude.lc 352:64-352:68  b_ -> c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 352:64-352:70  c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 352:64-352:72  c_ -> VecS d_ 4
 testdata/Prelude.lc 352:64-352:74  VecS Float 4
-testdata/Prelude.lc 352:67-352:68  V1
-testdata/Prelude.lc 352:69-352:70  V1
-testdata/Prelude.lc 352:71-352:72  V1
-testdata/Prelude.lc 352:73-352:74  V1
+testdata/Prelude.lc 352:67-352:68  b_
+testdata/Prelude.lc 352:69-352:70  b_
+testdata/Prelude.lc 352:71-352:72  b_
+testdata/Prelude.lc 352:73-352:74  b_
 testdata/Prelude.lc 354:9-354:12  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
-testdata/Prelude.lc 354:9-354:14  VecScalar V0 Float
-testdata/Prelude.lc 354:13-354:14  V2
+testdata/Prelude.lc 354:9-354:14  VecScalar a_ Float
+testdata/Prelude.lc 354:13-354:14  c_
 testdata/Prelude.lc 355:9-355:12  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
-testdata/Prelude.lc 355:9-355:14  VecScalar V1 Float
-testdata/Prelude.lc 355:13-355:14  VecScalar V2 Float
+testdata/Prelude.lc 355:9-355:14  VecScalar b_ Float
+testdata/Prelude.lc 355:13-355:14  VecScalar c_ Float
 testdata/Prelude.lc 357:1-357:14  Float -> Float -> Float -> Mat 4 4 Float
 testdata/Prelude.lc 357:23-357:33  VecScalar 1 Float -> Mat 4 4 Float
 testdata/Prelude.lc 357:23-357:35  Mat 4 4 Float
-testdata/Prelude.lc 357:23-357:39  Mat 4 V0 Float -> Mat 4 V1 Float
+testdata/Prelude.lc 357:23-357:39  Mat 4 a_ Float -> Mat 4 b_ Float
 testdata/Prelude.lc 357:23-357:52  Mat 4 4 Float
-testdata/Prelude.lc 357:23-357:56  Mat 4 V0 Float -> Mat 4 V1 Float
+testdata/Prelude.lc 357:23-357:56  Mat 4 a_ Float -> Mat 4 b_ Float
 testdata/Prelude.lc 357:23-357:69  Mat 4 4 Float
-testdata/Prelude.lc 357:34-357:35  V10
+testdata/Prelude.lc 357:34-357:35  k_
 testdata/Prelude.lc 357:36-357:39  {a:Nat} -> {b:Nat} -> {c} -> {d:Nat} -> Mat a b c -> Mat b d c -> Mat a d c
 testdata/Prelude.lc 357:40-357:50  VecScalar 1 Float -> Mat 4 4 Float
 testdata/Prelude.lc 357:40-357:52  Mat 4 4 Float
-testdata/Prelude.lc 357:51-357:52  V4
+testdata/Prelude.lc 357:51-357:52  e_
 testdata/Prelude.lc 357:53-357:56  {a:Nat} -> {b:Nat} -> {c} -> {d:Nat} -> Mat a b c -> Mat b d c -> Mat a d c
 testdata/Prelude.lc 357:57-357:67  VecScalar 1 Float -> Mat 4 4 Float
 testdata/Prelude.lc 357:57-357:69  Mat 4 4 Float
-testdata/Prelude.lc 357:68-357:69  V1
+testdata/Prelude.lc 357:68-357:69  b_
 testdata/Prelude.lc 359:21-359:24  Nat -> Type->Type
 testdata/Prelude.lc 359:21-359:26  Type->Type
 testdata/Prelude.lc 359:21-359:32  Type
-testdata/Prelude.lc 359:25-359:26  V1
+testdata/Prelude.lc 359:25-359:26  b_
 testdata/Prelude.lc 359:27-359:32  Type
 testdata/Prelude.lc 359:36-359:39  Nat -> Nat -> Type->Type
 testdata/Prelude.lc 359:36-359:41  Nat -> Type->Type
 testdata/Prelude.lc 359:36-359:43  Type->Type
 testdata/Prelude.lc 359:36-359:49  Type
-testdata/Prelude.lc 359:40-359:41  V1
-testdata/Prelude.lc 359:42-359:43  V1
+testdata/Prelude.lc 359:40-359:41  b_
+testdata/Prelude.lc 359:42-359:43  b_
 testdata/Prelude.lc 359:44-359:49  Type
 testdata/Prelude.lc 360:1-360:17  Vec 3 Float -> Mat 4 4 Float
 testdata/Prelude.lc 360:22-360:26  Vec 4 Float -> Vec 4 Float -> Vec 4 Float -> Vec 4 Float -> Mat 4 4 Float
@@ -1393,32 +1393,32 @@ testdata/Prelude.lc 360:30-360:32  {a} -> {_ : Num a} -> VecS a 4
 testdata/Prelude.lc 360:33-360:35  {a} -> {_ : Num a} -> VecS a 4
 testdata/Prelude.lc 360:36-360:38  VecS Float 4
 testdata/Prelude.lc 362:9-362:11  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 362:9-362:13  V1 -> V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 362:9-362:15  V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 362:9-362:17  V2 -> VecS V3 4
-testdata/Prelude.lc 362:9-362:19  VecS V2 4
-testdata/Prelude.lc 362:12-362:13  V1
-testdata/Prelude.lc 362:14-362:15  V1
-testdata/Prelude.lc 362:16-362:17  V1
-testdata/Prelude.lc 362:18-362:19  V1
+testdata/Prelude.lc 362:9-362:13  b_ -> c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 362:9-362:15  c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 362:9-362:17  c_ -> VecS d_ 4
+testdata/Prelude.lc 362:9-362:19  VecS c_ 4
+testdata/Prelude.lc 362:12-362:13  b_
+testdata/Prelude.lc 362:14-362:15  b_
+testdata/Prelude.lc 362:16-362:17  b_
+testdata/Prelude.lc 362:18-362:19  b_
 testdata/Prelude.lc 363:9-363:11  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 363:9-363:13  V1 -> V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 363:9-363:15  V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 363:9-363:17  V2 -> VecS V3 4
-testdata/Prelude.lc 363:9-363:19  VecS V2 4
-testdata/Prelude.lc 363:12-363:13  V1
-testdata/Prelude.lc 363:14-363:15  V1
-testdata/Prelude.lc 363:16-363:17  V1
-testdata/Prelude.lc 363:18-363:19  V1
+testdata/Prelude.lc 363:9-363:13  b_ -> c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 363:9-363:15  c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 363:9-363:17  c_ -> VecS d_ 4
+testdata/Prelude.lc 363:9-363:19  VecS c_ 4
+testdata/Prelude.lc 363:12-363:13  b_
+testdata/Prelude.lc 363:14-363:15  b_
+testdata/Prelude.lc 363:16-363:17  b_
+testdata/Prelude.lc 363:18-363:19  b_
 testdata/Prelude.lc 364:9-364:11  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 364:9-364:13  V1 -> V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 364:9-364:15  V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 364:9-364:17  V2 -> VecS V3 4
-testdata/Prelude.lc 364:9-364:19  VecS V2 4
-testdata/Prelude.lc 364:12-364:13  V1
-testdata/Prelude.lc 364:14-364:15  V1
-testdata/Prelude.lc 364:16-364:17  V1
-testdata/Prelude.lc 364:18-364:19  V1
+testdata/Prelude.lc 364:9-364:13  b_ -> c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 364:9-364:15  c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 364:9-364:17  c_ -> VecS d_ 4
+testdata/Prelude.lc 364:9-364:19  VecS c_ 4
+testdata/Prelude.lc 364:12-364:13  b_
+testdata/Prelude.lc 364:14-364:15  b_
+testdata/Prelude.lc 364:16-364:17  b_
+testdata/Prelude.lc 364:18-364:19  b_
 testdata/Prelude.lc 365:9-365:11  {a} -> a -> a -> a -> a -> VecS a 4
 testdata/Prelude.lc 365:9-365:15  Float -> Float -> Float -> VecS Float 4
 testdata/Prelude.lc 365:9-365:19  Float -> Float -> VecS Float 4
@@ -1430,34 +1430,34 @@ testdata/Prelude.lc 365:16-365:17  Vec 3 Float
 testdata/Prelude.lc 365:16-365:19  Float
 testdata/Prelude.lc 365:20-365:21  Vec 3 Float
 testdata/Prelude.lc 365:20-365:23  Float
-testdata/Prelude.lc 365:24-365:25  V1
+testdata/Prelude.lc 365:24-365:25  b_
 testdata/Prelude.lc 368:11-368:14  Nat -> Type->Type
 testdata/Prelude.lc 368:11-368:16  Type->Type
 testdata/Prelude.lc 368:11-368:22  Type
-testdata/Prelude.lc 368:15-368:16  V1
+testdata/Prelude.lc 368:15-368:16  b_
 testdata/Prelude.lc 368:17-368:22  Type
 testdata/Prelude.lc 369:11-369:14  Nat -> Type->Type
 testdata/Prelude.lc 369:11-369:16  Type->Type
 testdata/Prelude.lc 369:11-369:22  Type
 testdata/Prelude.lc 369:11-371:24  Type
-testdata/Prelude.lc 369:15-369:16  V1
+testdata/Prelude.lc 369:15-369:16  b_
 testdata/Prelude.lc 369:17-369:22  Type
 testdata/Prelude.lc 370:11-370:14  Nat -> Type->Type
 testdata/Prelude.lc 370:11-370:16  Type->Type
 testdata/Prelude.lc 370:11-370:22  Type
 testdata/Prelude.lc 370:11-371:24  Type
-testdata/Prelude.lc 370:15-370:16  V1
+testdata/Prelude.lc 370:15-370:16  b_
 testdata/Prelude.lc 370:17-370:22  Type
 testdata/Prelude.lc 371:11-371:14  Nat -> Nat -> Type->Type
 testdata/Prelude.lc 371:11-371:16  Nat -> Type->Type
 testdata/Prelude.lc 371:11-371:18  Type->Type
 testdata/Prelude.lc 371:11-371:24  Type
-testdata/Prelude.lc 371:15-371:16  V1
-testdata/Prelude.lc 371:17-371:18  V1
+testdata/Prelude.lc 371:15-371:16  b_
+testdata/Prelude.lc 371:17-371:18  b_
 testdata/Prelude.lc 371:19-371:24  Type
 testdata/Prelude.lc 372:1-372:7  Vec 3 Float -> Vec 3 Float -> Vec 3 Float -> Mat 4 4 Float
 testdata/Prelude.lc 372:24-372:25  Mat 4 4 Float
-testdata/Prelude.lc 372:24-372:29  Mat 4 V0 Float -> Mat 4 V1 Float
+testdata/Prelude.lc 372:24-372:29  Mat 4 a_ Float -> Mat 4 b_ Float
 testdata/Prelude.lc 372:24-372:56  Mat 4 4 Float
 testdata/Prelude.lc 372:24-378:65  Vec 3 Float -> Mat 4 4 Float | Vec 3 Float -> Vec 3 Float -> Mat 4 4 Float | Vec 3 Float -> Vec 3 Float -> Vec 3 Float -> Mat 4 4 Float
 testdata/Prelude.lc 372:26-372:29  {a:Nat} -> {b:Nat} -> {c} -> {d:Nat} -> Mat a b c -> Mat b d c -> Mat a d c
@@ -1467,19 +1467,19 @@ testdata/Prelude.lc 372:48-372:51  {a} -> {_ : Signed (MatVecScalarElem a)} -> a
 testdata/Prelude.lc 372:48-372:55  VecS Float 3
 testdata/Prelude.lc 372:52-372:55  Vec 3 Float
 testdata/Prelude.lc 374:14-374:16  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 374:14-374:20  V1 -> V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 374:14-374:24  V1 -> V2 -> VecS V3 4
-testdata/Prelude.lc 374:14-374:28  V1 -> VecS V2 4
-testdata/Prelude.lc 374:14-374:30  VecS V2 4
-testdata/Prelude.lc 374:17-374:18  V4
-testdata/Prelude.lc 374:17-374:20  V1
-testdata/Prelude.lc 374:21-374:22  VecS V3 V2
-testdata/Prelude.lc 374:21-374:24  V1
-testdata/Prelude.lc 374:25-374:26  VecS V3 V2
-testdata/Prelude.lc 374:25-374:28  V1
-testdata/Prelude.lc 374:29-374:30  V1
+testdata/Prelude.lc 374:14-374:20  b_ -> c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 374:14-374:24  b_ -> c_ -> VecS d_ 4
+testdata/Prelude.lc 374:14-374:28  b_ -> VecS c_ 4
+testdata/Prelude.lc 374:14-374:30  VecS c_ 4
+testdata/Prelude.lc 374:17-374:18  e_
+testdata/Prelude.lc 374:17-374:20  b_
+testdata/Prelude.lc 374:21-374:22  VecS d_ c_
+testdata/Prelude.lc 374:21-374:24  b_
+testdata/Prelude.lc 374:25-374:26  VecS d_ c_
+testdata/Prelude.lc 374:25-374:28  b_
+testdata/Prelude.lc 374:29-374:30  b_
 testdata/Prelude.lc 375:9-375:18  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
-testdata/Prelude.lc 375:9-375:20  VecScalar V0 Float -> VecScalar V1 Float
+testdata/Prelude.lc 375:9-375:20  VecScalar a_ Float -> VecScalar b_ Float
 testdata/Prelude.lc 375:9-375:33  VecScalar 3 Float
 testdata/Prelude.lc 375:19-375:20  {a} -> {b} -> a->b -> a->b
 testdata/Prelude.lc 375:21-375:24  Vec 3 Float
@@ -1488,7 +1488,7 @@ testdata/Prelude.lc 375:21-375:33  VecS Float 3
 testdata/Prelude.lc 375:25-375:26  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
 testdata/Prelude.lc 375:27-375:33  Vec 3 Float
 testdata/Prelude.lc 376:9-376:18  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
-testdata/Prelude.lc 376:9-376:20  VecScalar V0 Float -> VecScalar V1 Float
+testdata/Prelude.lc 376:9-376:20  VecScalar a_ Float -> VecScalar b_ Float
 testdata/Prelude.lc 376:9-376:33  VecScalar 3 Float
 testdata/Prelude.lc 376:19-376:20  {a} -> {b} -> a->b -> a->b
 testdata/Prelude.lc 376:21-376:23  Vec 3 Float
@@ -1502,7 +1502,7 @@ testdata/Prelude.lc 377:9-377:20  VecS Float 3
 testdata/Prelude.lc 377:11-377:18  {a} -> {_ : a ~ VecS Float 3} -> a -> a->a
 testdata/Prelude.lc 377:19-377:20  VecScalar 3 Float
 testdata/Prelude.lc 378:9-378:18  {a:Nat} -> {b:Nat} -> {c} -> Mat a b c -> Mat b a c
-testdata/Prelude.lc 378:9-378:20  Mat V2 V1 V0 -> Mat V2 V3 V1
+testdata/Prelude.lc 378:9-378:20  Mat c_ b_ a_ -> Mat c_ d_ b_
 testdata/Prelude.lc 378:9-378:65  Mat 4 4 Float
 testdata/Prelude.lc 378:19-378:20  {a} -> {b} -> a->b -> a->b
 testdata/Prelude.lc 378:21-378:25  Vec 4 Float -> Vec 4 Float -> Vec 4 Float -> Vec 4 Float -> Mat 4 4 Float
@@ -1520,30 +1520,30 @@ testdata/Prelude.lc 378:45-378:49  {a} -> {b:Nat} -> {_ : Num a} -> VecS a b ->
 testdata/Prelude.lc 378:45-378:51  VecS Float 4
 testdata/Prelude.lc 378:50-378:51  VecScalar 3 Float
 testdata/Prelude.lc 378:54-378:56  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 378:54-378:58  V1 -> V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 378:54-378:60  V2 -> V3 -> VecS V4 4
-testdata/Prelude.lc 378:54-378:62  V2 -> VecS V3 4
+testdata/Prelude.lc 378:54-378:58  b_ -> c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 378:54-378:60  c_ -> d_ -> VecS e_ 4
+testdata/Prelude.lc 378:54-378:62  c_ -> VecS d_ 4
 testdata/Prelude.lc 378:54-378:64  VecS Float 4
-testdata/Prelude.lc 378:57-378:58  V1
-testdata/Prelude.lc 378:59-378:60  V1
-testdata/Prelude.lc 378:61-378:62  V1
-testdata/Prelude.lc 378:63-378:64  V1
+testdata/Prelude.lc 378:57-378:58  b_
+testdata/Prelude.lc 378:59-378:60  b_
+testdata/Prelude.lc 378:61-378:62  b_
+testdata/Prelude.lc 378:63-378:64  b_
 testdata/Prelude.lc 380:1-380:6  Float -> VecS Float 4 -> VecS Float 4
-testdata/Prelude.lc 380:13-380:14  V3
-testdata/Prelude.lc 380:13-380:16  V2->V3
+testdata/Prelude.lc 380:13-380:14  d_
+testdata/Prelude.lc 380:13-380:16  c_->d_
 testdata/Prelude.lc 380:13-380:29  VecS Float 4
 testdata/Prelude.lc 380:15-380:16  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
 testdata/Prelude.lc 380:17-380:19  {a} -> a -> a -> a -> a -> VecS a 4
-testdata/Prelude.lc 380:17-380:21  V4 -> V5 -> V6 -> VecS V7 4
-testdata/Prelude.lc 380:17-380:23  V4 -> V5 -> VecS V6 4
-testdata/Prelude.lc 380:17-380:25  V4 -> VecS V5 4
+testdata/Prelude.lc 380:17-380:21  e_ -> f_ -> g_ -> VecS h_ 4
+testdata/Prelude.lc 380:17-380:23  e_ -> f_ -> VecS g_ 4
+testdata/Prelude.lc 380:17-380:25  e_ -> VecS f_ 4
 testdata/Prelude.lc 380:17-380:29  VecS Float 4
-testdata/Prelude.lc 380:20-380:21  V5
-testdata/Prelude.lc 380:22-380:23  V4
-testdata/Prelude.lc 380:24-380:25  V4
+testdata/Prelude.lc 380:20-380:21  f_
+testdata/Prelude.lc 380:22-380:23  e_
+testdata/Prelude.lc 380:24-380:25  e_
 testdata/Prelude.lc 380:26-380:29  Float
 testdata/Prelude.lc 382:11-382:16  Type
-testdata/Prelude.lc 382:11-385:38  Float -> Float -> List Float | V0->V1
+testdata/Prelude.lc 382:11-385:38  Float -> Float -> List Float | a_->b_
 testdata/Prelude.lc 382:20-382:25  Type
 testdata/Prelude.lc 382:20-382:36  Type
 testdata/Prelude.lc 382:29-382:36  Type
@@ -1568,27 +1568,27 @@ testdata/Prelude.lc 385:30-385:31  Float
 testdata/Prelude.lc 385:30-385:33  Float->Float
 testdata/Prelude.lc 385:30-385:35  Float
 testdata/Prelude.lc 385:32-385:33  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
-testdata/Prelude.lc 385:34-385:35  V1
+testdata/Prelude.lc 385:34-385:35  b_
 testdata/Prelude.lc 385:37-385:38  Float
 testdata/Prelude.lc 387:9-387:12  Type
 testdata/Prelude.lc 387:9-387:24  Type
-testdata/Prelude.lc 387:9-389:30  V0->V1 | {a} -> List a -> Int->a
-testdata/Prelude.lc 387:10-387:11  V1
+testdata/Prelude.lc 387:9-389:30  a_->b_ | {a} -> List a -> Int->a
+testdata/Prelude.lc 387:10-387:11  b_
 testdata/Prelude.lc 387:16-387:19  Type
 testdata/Prelude.lc 387:16-387:24  Type
 testdata/Prelude.lc 387:23-387:24  Type
 testdata/Prelude.lc 388:10-388:12  {a} -> List a -> Int->a
-testdata/Prelude.lc 388:19-388:20  V3
-testdata/Prelude.lc 388:19-389:30  Bool->V4 | Int->V2 | List V0 -> Int->V2 | List V2 -> V2 | V1 -> List V2 -> V2 | V2
-testdata/Prelude.lc 389:19-389:21  List V5
-testdata/Prelude.lc 389:19-389:24  Int->V5
-testdata/Prelude.lc 389:19-389:30  V3
+testdata/Prelude.lc 388:19-388:20  d_
+testdata/Prelude.lc 388:19-389:30  Bool->e_ | Int->c_ | List a_ -> Int->c_ | List c_ -> c_ | b_ -> List c_ -> c_ | c_
+testdata/Prelude.lc 389:19-389:21  List f_
+testdata/Prelude.lc 389:19-389:24  Int->f_
+testdata/Prelude.lc 389:19-389:30  d_
 testdata/Prelude.lc 389:22-389:24  {a} -> List a -> Int->a
 testdata/Prelude.lc 389:26-389:27  Int
 testdata/Prelude.lc 389:26-389:28  Int->Int
 testdata/Prelude.lc 389:26-389:29  Int
 testdata/Prelude.lc 389:27-389:28  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
-testdata/Prelude.lc 389:28-389:29  V1
+testdata/Prelude.lc 389:28-389:29  b_
 ------------ warnings
 Uncovered pattern(s) at testdata/Prelude.lc:50:1:
 tail (_: xs) = xs
diff --git a/testdata/SampleMaterial.out b/testdata/SampleMaterial.out
index 32f6b74f..53ea5d71 100644
--- a/testdata/SampleMaterial.out
+++ b/testdata/SampleMaterial.out
@@ -22,7 +22,7 @@ testdata/SampleMaterial.lc 5:7-45:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 6:24-6:26  ()
 testdata/SampleMaterial.lc 7:24-7:26  ()
 testdata/SampleMaterial.lc 8:22-8:27  Bool
-testdata/SampleMaterial.lc 9:20-9:21  V1
+testdata/SampleMaterial.lc 9:20-9:21  b_
 testdata/SampleMaterial.lc 10:30-10:35  Bool
 testdata/SampleMaterial.lc 11:23-11:28  Bool
 testdata/SampleMaterial.lc 12:20-12:33  CullType
@@ -102,7 +102,7 @@ testdata/SampleMaterial.lc 48:7-88:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 49:24-49:26  ()
 testdata/SampleMaterial.lc 50:24-50:26  ()
 testdata/SampleMaterial.lc 51:22-51:27  Bool
-testdata/SampleMaterial.lc 52:20-52:21  V1
+testdata/SampleMaterial.lc 52:20-52:21  b_
 testdata/SampleMaterial.lc 53:30-53:35  Bool
 testdata/SampleMaterial.lc 54:23-54:28  Bool
 testdata/SampleMaterial.lc 55:20-55:33  CullType
@@ -182,7 +182,7 @@ testdata/SampleMaterial.lc 91:7-131:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 92:24-92:26  ()
 testdata/SampleMaterial.lc 93:24-93:26  ()
 testdata/SampleMaterial.lc 94:22-94:27  Bool
-testdata/SampleMaterial.lc 95:20-95:21  V1
+testdata/SampleMaterial.lc 95:20-95:21  b_
 testdata/SampleMaterial.lc 96:30-96:35  Bool
 testdata/SampleMaterial.lc 97:23-97:28  Bool
 testdata/SampleMaterial.lc 98:20-98:33  CullType
@@ -262,7 +262,7 @@ testdata/SampleMaterial.lc 134:7-174:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 135:24-135:26  ()
 testdata/SampleMaterial.lc 136:24-136:26  ()
 testdata/SampleMaterial.lc 137:22-137:27  Bool
-testdata/SampleMaterial.lc 138:20-138:21  V1
+testdata/SampleMaterial.lc 138:20-138:21  b_
 testdata/SampleMaterial.lc 139:30-139:35  Bool
 testdata/SampleMaterial.lc 140:23-140:28  Bool
 testdata/SampleMaterial.lc 141:20-141:33  CullType
@@ -342,7 +342,7 @@ testdata/SampleMaterial.lc 177:7-231:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 178:24-178:26  ()
 testdata/SampleMaterial.lc 179:24-179:26  ()
 testdata/SampleMaterial.lc 180:22-180:27  Bool
-testdata/SampleMaterial.lc 181:20-181:21  V1
+testdata/SampleMaterial.lc 181:20-181:21  b_
 testdata/SampleMaterial.lc 182:30-182:35  Bool
 testdata/SampleMaterial.lc 183:23-183:28  Bool
 testdata/SampleMaterial.lc 184:20-184:33  CullType
@@ -472,7 +472,7 @@ testdata/SampleMaterial.lc 234:7-274:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 235:24-235:26  ()
 testdata/SampleMaterial.lc 236:24-236:26  ()
 testdata/SampleMaterial.lc 237:22-237:27  Bool
-testdata/SampleMaterial.lc 238:20-238:21  V1
+testdata/SampleMaterial.lc 238:20-238:21  b_
 testdata/SampleMaterial.lc 239:30-239:35  Bool
 testdata/SampleMaterial.lc 240:23-240:28  Bool
 testdata/SampleMaterial.lc 241:20-241:33  CullType
@@ -552,7 +552,7 @@ testdata/SampleMaterial.lc 277:7-317:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 278:24-278:26  ()
 testdata/SampleMaterial.lc 279:24-279:26  ()
 testdata/SampleMaterial.lc 280:22-280:27  Bool
-testdata/SampleMaterial.lc 281:20-281:21  V1
+testdata/SampleMaterial.lc 281:20-281:21  b_
 testdata/SampleMaterial.lc 282:30-282:35  Bool
 testdata/SampleMaterial.lc 283:23-283:28  Bool
 testdata/SampleMaterial.lc 284:20-284:33  CullType
@@ -632,7 +632,7 @@ testdata/SampleMaterial.lc 320:7-360:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 321:24-321:26  ()
 testdata/SampleMaterial.lc 322:24-322:26  ()
 testdata/SampleMaterial.lc 323:22-323:27  Bool
-testdata/SampleMaterial.lc 324:20-324:21  V1
+testdata/SampleMaterial.lc 324:20-324:21  b_
 testdata/SampleMaterial.lc 325:30-325:35  Bool
 testdata/SampleMaterial.lc 326:23-326:28  Bool
 testdata/SampleMaterial.lc 327:20-327:33  CullType
@@ -712,7 +712,7 @@ testdata/SampleMaterial.lc 363:7-403:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 364:24-364:26  ()
 testdata/SampleMaterial.lc 365:24-365:26  ()
 testdata/SampleMaterial.lc 366:22-366:27  Bool
-testdata/SampleMaterial.lc 367:20-367:21  V1
+testdata/SampleMaterial.lc 367:20-367:21  b_
 testdata/SampleMaterial.lc 368:30-368:35  Bool
 testdata/SampleMaterial.lc 369:23-369:28  Bool
 testdata/SampleMaterial.lc 370:20-370:33  CullType
@@ -792,7 +792,7 @@ testdata/SampleMaterial.lc 406:7-446:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 407:24-407:26  ()
 testdata/SampleMaterial.lc 408:24-408:26  ()
 testdata/SampleMaterial.lc 409:22-409:27  Bool
-testdata/SampleMaterial.lc 410:20-410:21  V1
+testdata/SampleMaterial.lc 410:20-410:21  b_
 testdata/SampleMaterial.lc 411:30-411:35  Bool
 testdata/SampleMaterial.lc 412:23-412:28  Bool
 testdata/SampleMaterial.lc 413:20-413:33  CullType
@@ -872,7 +872,7 @@ testdata/SampleMaterial.lc 449:7-489:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 450:24-450:26  ()
 testdata/SampleMaterial.lc 451:24-451:26  ()
 testdata/SampleMaterial.lc 452:22-452:27  Bool
-testdata/SampleMaterial.lc 453:20-453:21  V1
+testdata/SampleMaterial.lc 453:20-453:21  b_
 testdata/SampleMaterial.lc 454:30-454:35  Bool
 testdata/SampleMaterial.lc 455:23-455:28  Bool
 testdata/SampleMaterial.lc 456:20-456:33  CullType
@@ -952,7 +952,7 @@ testdata/SampleMaterial.lc 492:7-532:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 493:24-493:26  ()
 testdata/SampleMaterial.lc 494:24-494:26  ()
 testdata/SampleMaterial.lc 495:22-495:27  Bool
-testdata/SampleMaterial.lc 496:20-496:21  V1
+testdata/SampleMaterial.lc 496:20-496:21  b_
 testdata/SampleMaterial.lc 497:30-497:35  Bool
 testdata/SampleMaterial.lc 498:23-498:28  Bool
 testdata/SampleMaterial.lc 499:20-499:33  CullType
@@ -1032,7 +1032,7 @@ testdata/SampleMaterial.lc 535:7-575:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 536:24-536:26  ()
 testdata/SampleMaterial.lc 537:24-537:26  ()
 testdata/SampleMaterial.lc 538:22-538:27  Bool
-testdata/SampleMaterial.lc 539:20-539:21  V1
+testdata/SampleMaterial.lc 539:20-539:21  b_
 testdata/SampleMaterial.lc 540:30-540:35  Bool
 testdata/SampleMaterial.lc 541:23-541:28  Bool
 testdata/SampleMaterial.lc 542:20-542:33  CullType
@@ -1112,7 +1112,7 @@ testdata/SampleMaterial.lc 578:7-618:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 579:24-579:26  ()
 testdata/SampleMaterial.lc 580:24-580:26  ()
 testdata/SampleMaterial.lc 581:22-581:27  Bool
-testdata/SampleMaterial.lc 582:20-582:21  V1
+testdata/SampleMaterial.lc 582:20-582:21  b_
 testdata/SampleMaterial.lc 583:30-583:35  Bool
 testdata/SampleMaterial.lc 584:23-584:28  Bool
 testdata/SampleMaterial.lc 585:20-585:33  CullType
@@ -1192,7 +1192,7 @@ testdata/SampleMaterial.lc 621:7-661:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 622:24-622:26  ()
 testdata/SampleMaterial.lc 623:24-623:26  ()
 testdata/SampleMaterial.lc 624:22-624:27  Bool
-testdata/SampleMaterial.lc 625:20-625:21  V1
+testdata/SampleMaterial.lc 625:20-625:21  b_
 testdata/SampleMaterial.lc 626:30-626:35  Bool
 testdata/SampleMaterial.lc 627:23-627:28  Bool
 testdata/SampleMaterial.lc 628:20-628:33  CullType
@@ -1272,7 +1272,7 @@ testdata/SampleMaterial.lc 664:7-704:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 665:24-665:26  ()
 testdata/SampleMaterial.lc 666:24-666:26  ()
 testdata/SampleMaterial.lc 667:22-667:27  Bool
-testdata/SampleMaterial.lc 668:20-668:21  V1
+testdata/SampleMaterial.lc 668:20-668:21  b_
 testdata/SampleMaterial.lc 669:30-669:35  Bool
 testdata/SampleMaterial.lc 670:23-670:28  Bool
 testdata/SampleMaterial.lc 671:20-671:33  CullType
@@ -1352,7 +1352,7 @@ testdata/SampleMaterial.lc 707:7-747:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 708:24-708:26  ()
 testdata/SampleMaterial.lc 709:24-709:26  ()
 testdata/SampleMaterial.lc 710:22-710:27  Bool
-testdata/SampleMaterial.lc 711:20-711:21  V1
+testdata/SampleMaterial.lc 711:20-711:21  b_
 testdata/SampleMaterial.lc 712:30-712:35  Bool
 testdata/SampleMaterial.lc 713:23-713:28  Bool
 testdata/SampleMaterial.lc 714:20-714:33  CullType
@@ -1432,7 +1432,7 @@ testdata/SampleMaterial.lc 750:7-790:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 751:24-751:26  ()
 testdata/SampleMaterial.lc 752:24-752:26  ()
 testdata/SampleMaterial.lc 753:22-753:27  Bool
-testdata/SampleMaterial.lc 754:20-754:21  V1
+testdata/SampleMaterial.lc 754:20-754:21  b_
 testdata/SampleMaterial.lc 755:30-755:35  Bool
 testdata/SampleMaterial.lc 756:23-756:28  Bool
 testdata/SampleMaterial.lc 757:20-757:33  CullType
@@ -1512,7 +1512,7 @@ testdata/SampleMaterial.lc 793:7-833:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 794:24-794:26  ()
 testdata/SampleMaterial.lc 795:24-795:26  ()
 testdata/SampleMaterial.lc 796:22-796:27  Bool
-testdata/SampleMaterial.lc 797:20-797:21  V1
+testdata/SampleMaterial.lc 797:20-797:21  b_
 testdata/SampleMaterial.lc 798:30-798:35  Bool
 testdata/SampleMaterial.lc 799:23-799:28  Bool
 testdata/SampleMaterial.lc 800:20-800:33  CullType
@@ -1592,7 +1592,7 @@ testdata/SampleMaterial.lc 836:7-890:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 837:24-837:26  ()
 testdata/SampleMaterial.lc 838:24-838:26  ()
 testdata/SampleMaterial.lc 839:22-839:27  Bool
-testdata/SampleMaterial.lc 840:20-840:21  V1
+testdata/SampleMaterial.lc 840:20-840:21  b_
 testdata/SampleMaterial.lc 841:30-841:35  Bool
 testdata/SampleMaterial.lc 842:23-842:28  Bool
 testdata/SampleMaterial.lc 843:20-843:33  CullType
@@ -1722,7 +1722,7 @@ testdata/SampleMaterial.lc 893:7-933:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 894:24-894:26  ()
 testdata/SampleMaterial.lc 895:24-895:26  ()
 testdata/SampleMaterial.lc 896:22-896:27  Bool
-testdata/SampleMaterial.lc 897:20-897:21  V1
+testdata/SampleMaterial.lc 897:20-897:21  b_
 testdata/SampleMaterial.lc 898:30-898:35  Bool
 testdata/SampleMaterial.lc 899:23-899:28  Bool
 testdata/SampleMaterial.lc 900:20-900:33  CullType
@@ -1802,7 +1802,7 @@ testdata/SampleMaterial.lc 936:7-977:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 937:24-937:26  ()
 testdata/SampleMaterial.lc 938:24-938:26  ()
 testdata/SampleMaterial.lc 939:22-939:27  Bool
-testdata/SampleMaterial.lc 940:20-940:21  V1
+testdata/SampleMaterial.lc 940:20-940:21  b_
 testdata/SampleMaterial.lc 941:30-941:35  Bool
 testdata/SampleMaterial.lc 942:23-942:28  Bool
 testdata/SampleMaterial.lc 943:20-943:33  CullType
@@ -1882,7 +1882,7 @@ testdata/SampleMaterial.lc 980:7-1020:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 981:24-981:26  ()
 testdata/SampleMaterial.lc 982:24-982:26  ()
 testdata/SampleMaterial.lc 983:22-983:27  Bool
-testdata/SampleMaterial.lc 984:20-984:21  V1
+testdata/SampleMaterial.lc 984:20-984:21  b_
 testdata/SampleMaterial.lc 985:30-985:35  Bool
 testdata/SampleMaterial.lc 986:23-986:28  Bool
 testdata/SampleMaterial.lc 987:20-987:33  CullType
@@ -1962,7 +1962,7 @@ testdata/SampleMaterial.lc 1023:7-1063:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1024:24-1024:26  ()
 testdata/SampleMaterial.lc 1025:24-1025:26  ()
 testdata/SampleMaterial.lc 1026:22-1026:27  Bool
-testdata/SampleMaterial.lc 1027:20-1027:21  V1
+testdata/SampleMaterial.lc 1027:20-1027:21  b_
 testdata/SampleMaterial.lc 1028:30-1028:35  Bool
 testdata/SampleMaterial.lc 1029:23-1029:28  Bool
 testdata/SampleMaterial.lc 1030:20-1030:33  CullType
@@ -2042,7 +2042,7 @@ testdata/SampleMaterial.lc 1066:7-1106:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1067:24-1067:26  ()
 testdata/SampleMaterial.lc 1068:24-1068:26  ()
 testdata/SampleMaterial.lc 1069:22-1069:27  Bool
-testdata/SampleMaterial.lc 1070:20-1070:21  V1
+testdata/SampleMaterial.lc 1070:20-1070:21  b_
 testdata/SampleMaterial.lc 1071:30-1071:35  Bool
 testdata/SampleMaterial.lc 1072:23-1072:28  Bool
 testdata/SampleMaterial.lc 1073:20-1073:33  CullType
@@ -2122,7 +2122,7 @@ testdata/SampleMaterial.lc 1109:7-1149:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1110:24-1110:26  ()
 testdata/SampleMaterial.lc 1111:24-1111:26  ()
 testdata/SampleMaterial.lc 1112:22-1112:27  Bool
-testdata/SampleMaterial.lc 1113:20-1113:21  V1
+testdata/SampleMaterial.lc 1113:20-1113:21  b_
 testdata/SampleMaterial.lc 1114:30-1114:35  Bool
 testdata/SampleMaterial.lc 1115:23-1115:28  Bool
 testdata/SampleMaterial.lc 1116:20-1116:33  CullType
@@ -2202,7 +2202,7 @@ testdata/SampleMaterial.lc 1152:7-1192:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1153:24-1153:26  ()
 testdata/SampleMaterial.lc 1154:24-1154:26  ()
 testdata/SampleMaterial.lc 1155:22-1155:27  Bool
-testdata/SampleMaterial.lc 1156:20-1156:21  V1
+testdata/SampleMaterial.lc 1156:20-1156:21  b_
 testdata/SampleMaterial.lc 1157:30-1157:35  Bool
 testdata/SampleMaterial.lc 1158:23-1158:28  Bool
 testdata/SampleMaterial.lc 1159:20-1159:33  CullType
@@ -2282,7 +2282,7 @@ testdata/SampleMaterial.lc 1195:7-1235:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1196:24-1196:26  ()
 testdata/SampleMaterial.lc 1197:24-1197:26  ()
 testdata/SampleMaterial.lc 1198:22-1198:27  Bool
-testdata/SampleMaterial.lc 1199:20-1199:21  V1
+testdata/SampleMaterial.lc 1199:20-1199:21  b_
 testdata/SampleMaterial.lc 1200:30-1200:35  Bool
 testdata/SampleMaterial.lc 1201:23-1201:28  Bool
 testdata/SampleMaterial.lc 1202:20-1202:33  CullType
@@ -2362,7 +2362,7 @@ testdata/SampleMaterial.lc 1238:7-1278:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1239:24-1239:26  ()
 testdata/SampleMaterial.lc 1240:24-1240:26  ()
 testdata/SampleMaterial.lc 1241:22-1241:27  Bool
-testdata/SampleMaterial.lc 1242:20-1242:21  V1
+testdata/SampleMaterial.lc 1242:20-1242:21  b_
 testdata/SampleMaterial.lc 1243:30-1243:35  Bool
 testdata/SampleMaterial.lc 1244:23-1244:28  Bool
 testdata/SampleMaterial.lc 1245:20-1245:33  CullType
@@ -2442,7 +2442,7 @@ testdata/SampleMaterial.lc 1281:7-1321:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1282:24-1282:26  ()
 testdata/SampleMaterial.lc 1283:24-1283:26  ()
 testdata/SampleMaterial.lc 1284:22-1284:27  Bool
-testdata/SampleMaterial.lc 1285:20-1285:21  V1
+testdata/SampleMaterial.lc 1285:20-1285:21  b_
 testdata/SampleMaterial.lc 1286:30-1286:35  Bool
 testdata/SampleMaterial.lc 1287:23-1287:28  Bool
 testdata/SampleMaterial.lc 1288:20-1288:33  CullType
@@ -2522,7 +2522,7 @@ testdata/SampleMaterial.lc 1324:7-1364:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1325:24-1325:26  ()
 testdata/SampleMaterial.lc 1326:24-1326:26  ()
 testdata/SampleMaterial.lc 1327:22-1327:27  Bool
-testdata/SampleMaterial.lc 1328:20-1328:21  V1
+testdata/SampleMaterial.lc 1328:20-1328:21  b_
 testdata/SampleMaterial.lc 1329:30-1329:35  Bool
 testdata/SampleMaterial.lc 1330:23-1330:28  Bool
 testdata/SampleMaterial.lc 1331:20-1331:33  CullType
@@ -2602,7 +2602,7 @@ testdata/SampleMaterial.lc 1367:7-1407:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1368:24-1368:26  ()
 testdata/SampleMaterial.lc 1369:24-1369:26  ()
 testdata/SampleMaterial.lc 1370:22-1370:27  Bool
-testdata/SampleMaterial.lc 1371:20-1371:21  V1
+testdata/SampleMaterial.lc 1371:20-1371:21  b_
 testdata/SampleMaterial.lc 1372:30-1372:35  Bool
 testdata/SampleMaterial.lc 1373:23-1373:28  Bool
 testdata/SampleMaterial.lc 1374:20-1374:33  CullType
@@ -2682,7 +2682,7 @@ testdata/SampleMaterial.lc 1410:7-1450:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1411:24-1411:26  ()
 testdata/SampleMaterial.lc 1412:24-1412:26  ()
 testdata/SampleMaterial.lc 1413:22-1413:27  Bool
-testdata/SampleMaterial.lc 1414:20-1414:21  V1
+testdata/SampleMaterial.lc 1414:20-1414:21  b_
 testdata/SampleMaterial.lc 1415:30-1415:35  Bool
 testdata/SampleMaterial.lc 1416:23-1416:28  Bool
 testdata/SampleMaterial.lc 1417:20-1417:33  CullType
@@ -2762,7 +2762,7 @@ testdata/SampleMaterial.lc 1453:7-1493:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1454:24-1454:26  ()
 testdata/SampleMaterial.lc 1455:24-1455:26  ()
 testdata/SampleMaterial.lc 1456:22-1456:27  Bool
-testdata/SampleMaterial.lc 1457:20-1457:21  V1
+testdata/SampleMaterial.lc 1457:20-1457:21  b_
 testdata/SampleMaterial.lc 1458:30-1458:35  Bool
 testdata/SampleMaterial.lc 1459:23-1459:28  Bool
 testdata/SampleMaterial.lc 1460:20-1460:33  CullType
@@ -2842,7 +2842,7 @@ testdata/SampleMaterial.lc 1496:7-1536:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1497:24-1497:26  ()
 testdata/SampleMaterial.lc 1498:24-1498:26  ()
 testdata/SampleMaterial.lc 1499:22-1499:27  Bool
-testdata/SampleMaterial.lc 1500:20-1500:21  V1
+testdata/SampleMaterial.lc 1500:20-1500:21  b_
 testdata/SampleMaterial.lc 1501:30-1501:35  Bool
 testdata/SampleMaterial.lc 1502:23-1502:28  Bool
 testdata/SampleMaterial.lc 1503:20-1503:33  CullType
@@ -2922,7 +2922,7 @@ testdata/SampleMaterial.lc 1539:7-1579:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1540:24-1540:26  ()
 testdata/SampleMaterial.lc 1541:24-1541:26  ()
 testdata/SampleMaterial.lc 1542:22-1542:27  Bool
-testdata/SampleMaterial.lc 1543:20-1543:21  V1
+testdata/SampleMaterial.lc 1543:20-1543:21  b_
 testdata/SampleMaterial.lc 1544:30-1544:35  Bool
 testdata/SampleMaterial.lc 1545:23-1545:28  Bool
 testdata/SampleMaterial.lc 1546:20-1546:33  CullType
@@ -3002,7 +3002,7 @@ testdata/SampleMaterial.lc 1582:7-1622:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1583:24-1583:26  ()
 testdata/SampleMaterial.lc 1584:24-1584:26  ()
 testdata/SampleMaterial.lc 1585:22-1585:27  Bool
-testdata/SampleMaterial.lc 1586:20-1586:21  V1
+testdata/SampleMaterial.lc 1586:20-1586:21  b_
 testdata/SampleMaterial.lc 1587:30-1587:35  Bool
 testdata/SampleMaterial.lc 1588:23-1588:28  Bool
 testdata/SampleMaterial.lc 1589:20-1589:33  CullType
@@ -3082,7 +3082,7 @@ testdata/SampleMaterial.lc 1625:7-1665:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1626:24-1626:26  ()
 testdata/SampleMaterial.lc 1627:24-1627:26  ()
 testdata/SampleMaterial.lc 1628:22-1628:27  Bool
-testdata/SampleMaterial.lc 1629:20-1629:21  V1
+testdata/SampleMaterial.lc 1629:20-1629:21  b_
 testdata/SampleMaterial.lc 1630:30-1630:35  Bool
 testdata/SampleMaterial.lc 1631:23-1631:28  Bool
 testdata/SampleMaterial.lc 1632:20-1632:33  CullType
@@ -3162,7 +3162,7 @@ testdata/SampleMaterial.lc 1668:7-1708:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1669:24-1669:26  ()
 testdata/SampleMaterial.lc 1670:24-1670:26  ()
 testdata/SampleMaterial.lc 1671:22-1671:27  Bool
-testdata/SampleMaterial.lc 1672:20-1672:21  V1
+testdata/SampleMaterial.lc 1672:20-1672:21  b_
 testdata/SampleMaterial.lc 1673:30-1673:35  Bool
 testdata/SampleMaterial.lc 1674:23-1674:28  Bool
 testdata/SampleMaterial.lc 1675:20-1675:33  CullType
@@ -3242,7 +3242,7 @@ testdata/SampleMaterial.lc 1711:7-1751:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1712:24-1712:26  ()
 testdata/SampleMaterial.lc 1713:24-1713:26  ()
 testdata/SampleMaterial.lc 1714:22-1714:27  Bool
-testdata/SampleMaterial.lc 1715:20-1715:21  V1
+testdata/SampleMaterial.lc 1715:20-1715:21  b_
 testdata/SampleMaterial.lc 1716:30-1716:35  Bool
 testdata/SampleMaterial.lc 1717:23-1717:28  Bool
 testdata/SampleMaterial.lc 1718:20-1718:33  CullType
@@ -3322,7 +3322,7 @@ testdata/SampleMaterial.lc 1754:7-1794:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1755:24-1755:26  ()
 testdata/SampleMaterial.lc 1756:24-1756:26  ()
 testdata/SampleMaterial.lc 1757:22-1757:27  Bool
-testdata/SampleMaterial.lc 1758:20-1758:21  V1
+testdata/SampleMaterial.lc 1758:20-1758:21  b_
 testdata/SampleMaterial.lc 1759:30-1759:35  Bool
 testdata/SampleMaterial.lc 1760:23-1760:28  Bool
 testdata/SampleMaterial.lc 1761:20-1761:33  CullType
@@ -3402,7 +3402,7 @@ testdata/SampleMaterial.lc 1797:7-1837:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1798:24-1798:26  ()
 testdata/SampleMaterial.lc 1799:24-1799:26  ()
 testdata/SampleMaterial.lc 1800:22-1800:27  Bool
-testdata/SampleMaterial.lc 1801:20-1801:21  V1
+testdata/SampleMaterial.lc 1801:20-1801:21  b_
 testdata/SampleMaterial.lc 1802:30-1802:35  Bool
 testdata/SampleMaterial.lc 1803:23-1803:28  Bool
 testdata/SampleMaterial.lc 1804:20-1804:33  CullType
@@ -3482,7 +3482,7 @@ testdata/SampleMaterial.lc 1840:7-1880:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1841:24-1841:26  ()
 testdata/SampleMaterial.lc 1842:24-1842:26  ()
 testdata/SampleMaterial.lc 1843:22-1843:27  Bool
-testdata/SampleMaterial.lc 1844:20-1844:21  V1
+testdata/SampleMaterial.lc 1844:20-1844:21  b_
 testdata/SampleMaterial.lc 1845:30-1845:35  Bool
 testdata/SampleMaterial.lc 1846:23-1846:28  Bool
 testdata/SampleMaterial.lc 1847:20-1847:33  CullType
@@ -3562,7 +3562,7 @@ testdata/SampleMaterial.lc 1883:7-1923:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1884:24-1884:26  ()
 testdata/SampleMaterial.lc 1885:24-1885:26  ()
 testdata/SampleMaterial.lc 1886:22-1886:27  Bool
-testdata/SampleMaterial.lc 1887:20-1887:21  V1
+testdata/SampleMaterial.lc 1887:20-1887:21  b_
 testdata/SampleMaterial.lc 1888:30-1888:35  Bool
 testdata/SampleMaterial.lc 1889:23-1889:28  Bool
 testdata/SampleMaterial.lc 1890:20-1890:33  CullType
@@ -3642,7 +3642,7 @@ testdata/SampleMaterial.lc 1926:7-1966:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1927:24-1927:26  ()
 testdata/SampleMaterial.lc 1928:24-1928:26  ()
 testdata/SampleMaterial.lc 1929:22-1929:27  Bool
-testdata/SampleMaterial.lc 1930:20-1930:21  V1
+testdata/SampleMaterial.lc 1930:20-1930:21  b_
 testdata/SampleMaterial.lc 1931:30-1931:35  Bool
 testdata/SampleMaterial.lc 1932:23-1932:28  Bool
 testdata/SampleMaterial.lc 1933:20-1933:33  CullType
@@ -3722,7 +3722,7 @@ testdata/SampleMaterial.lc 1969:7-2009:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 1970:24-1970:26  ()
 testdata/SampleMaterial.lc 1971:24-1971:26  ()
 testdata/SampleMaterial.lc 1972:22-1972:27  Bool
-testdata/SampleMaterial.lc 1973:20-1973:21  V1
+testdata/SampleMaterial.lc 1973:20-1973:21  b_
 testdata/SampleMaterial.lc 1974:30-1974:35  Bool
 testdata/SampleMaterial.lc 1975:23-1975:28  Bool
 testdata/SampleMaterial.lc 1976:20-1976:33  CullType
@@ -3802,7 +3802,7 @@ testdata/SampleMaterial.lc 2012:7-2052:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 2013:24-2013:26  ()
 testdata/SampleMaterial.lc 2014:24-2014:26  ()
 testdata/SampleMaterial.lc 2015:22-2015:27  Bool
-testdata/SampleMaterial.lc 2016:20-2016:21  V1
+testdata/SampleMaterial.lc 2016:20-2016:21  b_
 testdata/SampleMaterial.lc 2017:30-2017:35  Bool
 testdata/SampleMaterial.lc 2018:23-2018:28  Bool
 testdata/SampleMaterial.lc 2019:20-2019:33  CullType
@@ -3882,7 +3882,7 @@ testdata/SampleMaterial.lc 2055:7-2095:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 2056:24-2056:26  ()
 testdata/SampleMaterial.lc 2057:24-2057:26  ()
 testdata/SampleMaterial.lc 2058:22-2058:27  Bool
-testdata/SampleMaterial.lc 2059:20-2059:21  V1
+testdata/SampleMaterial.lc 2059:20-2059:21  b_
 testdata/SampleMaterial.lc 2060:30-2060:35  Bool
 testdata/SampleMaterial.lc 2061:23-2061:28  Bool
 testdata/SampleMaterial.lc 2062:20-2062:33  CullType
@@ -3962,7 +3962,7 @@ testdata/SampleMaterial.lc 2098:7-2138:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 2099:24-2099:26  ()
 testdata/SampleMaterial.lc 2100:24-2100:26  ()
 testdata/SampleMaterial.lc 2101:22-2101:27  Bool
-testdata/SampleMaterial.lc 2102:20-2102:21  V1
+testdata/SampleMaterial.lc 2102:20-2102:21  b_
 testdata/SampleMaterial.lc 2103:30-2103:35  Bool
 testdata/SampleMaterial.lc 2104:23-2104:28  Bool
 testdata/SampleMaterial.lc 2105:20-2105:33  CullType
@@ -4041,7 +4041,7 @@ testdata/SampleMaterial.lc 2141:7-2181:10  ((CommonAttrs)) | CommonAttrs
 testdata/SampleMaterial.lc 2142:24-2142:26  ()
 testdata/SampleMaterial.lc 2143:24-2143:26  ()
 testdata/SampleMaterial.lc 2144:22-2144:27  Bool
-testdata/SampleMaterial.lc 2145:20-2145:21  V1
+testdata/SampleMaterial.lc 2145:20-2145:21  b_
 testdata/SampleMaterial.lc 2146:30-2146:35  Bool
 testdata/SampleMaterial.lc 2147:23-2147:28  Bool
 testdata/SampleMaterial.lc 2148:20-2148:33  CullType
diff --git a/testdata/adhoc.reject.out b/testdata/adhoc.reject.out
index da66ebcf..640292db 100644
--- a/testdata/adhoc.reject.out
+++ b/testdata/adhoc.reject.out
@@ -21,5 +21,5 @@ testdata/adhoc.reject.lc 4:5-4:8  {a} -> {_ : Component a}->a
 testdata/adhoc.reject.lc 4:12-4:15  Nat -> Type->Type
 testdata/adhoc.reject.lc 4:12-4:17  Type->Type
 testdata/adhoc.reject.lc 4:12-4:19  Type
-testdata/adhoc.reject.lc 4:16-4:17  V1
+testdata/adhoc.reject.lc 4:16-4:17  b_
 testdata/adhoc.reject.lc 4:18-4:19  Type
diff --git a/testdata/ambig.out b/testdata/ambig.out
index 2e7ae187..bf421b4d 100644
--- a/testdata/ambig.out
+++ b/testdata/ambig.out
@@ -3,10 +3,10 @@ main is not found
 h :: {a} -> {b} -> {c} -> {d} -> (b -> d->c) -> (b, d) -> a->c
 ------------ tooltips
 testdata/ambig.lc 4:1-4:2  {a} -> {b} -> {c} -> {d} -> (b -> d->c) -> (b, d) -> a->c
-testdata/ambig.lc 4:11-4:12  V2
-testdata/ambig.lc 7:9-7:29  V1
-testdata/ambig.lc 7:21-7:22  V18
-testdata/ambig.lc 7:21-7:26  HList V2 -> V2 | V2 | V2 -> HList V2 -> V2 | V3
-testdata/ambig.lc 7:23-7:24  V13
-testdata/ambig.lc 7:25-7:26  V9
-testdata/ambig.lc 7:28-7:29  V6
+testdata/ambig.lc 4:11-4:12  c_
+testdata/ambig.lc 7:9-7:29  b_
+testdata/ambig.lc 7:21-7:22  s_
+testdata/ambig.lc 7:21-7:26  HList c_ -> c_ | c_ | c_ -> HList c_ -> c_ | d_
+testdata/ambig.lc 7:23-7:24  n_
+testdata/ambig.lc 7:25-7:26  j_
+testdata/ambig.lc 7:28-7:29  g_
diff --git a/testdata/complex.out b/testdata/complex.out
index 263282e2..f751c2bb 100644
--- a/testdata/complex.out
+++ b/testdata/complex.out
@@ -31,7 +31,7 @@ testdata/complex.lc 5:6-5:13  Repr->Type | Type
 testdata/complex.lc 5:6-6:52  Type
 testdata/complex.lc 5:17-5:21  Type
 testdata/complex.lc 5:25-5:29  Type
-testdata/complex.lc 6:3-6:10  Complex V2 | {a:Repr} -> Float -> Float -> Complex a
+testdata/complex.lc 6:3-6:10  Complex c_ | {a:Repr} -> Float -> Float -> Complex a
 testdata/complex.lc 6:3-6:52  Type
 testdata/complex.lc 6:25-6:30  Type
 testdata/complex.lc 6:25-6:52  Type
@@ -39,14 +39,14 @@ testdata/complex.lc 6:34-6:39  Type
 testdata/complex.lc 6:34-6:52  Type
 testdata/complex.lc 6:43-6:50  Repr->Type
 testdata/complex.lc 6:43-6:52  Type
-testdata/complex.lc 6:51-6:52  Repr | V3
+testdata/complex.lc 6:51-6:52  Repr | d_
 testdata/complex.lc 8:20-8:27  Repr->Type
 testdata/complex.lc 8:20-8:29  Type
 testdata/complex.lc 8:20-8:37  Type
-testdata/complex.lc 8:28-8:29  V1
+testdata/complex.lc 8:28-8:29  b_
 testdata/complex.lc 8:33-8:37  Type
 testdata/complex.lc 9:1-9:5  {a:Repr} -> Complex a -> Repr
-testdata/complex.lc 9:13-9:14  Complex V0 -> Repr | Repr | {a:Repr} -> Complex a -> Repr
+testdata/complex.lc 9:13-9:14  Complex a_ -> Repr | Repr | {a:Repr} -> Complex a -> Repr
 testdata/complex.lc 11:11-11:16  Type
 testdata/complex.lc 11:20-11:25  Type
 testdata/complex.lc 11:20-11:43  Type
@@ -55,7 +55,7 @@ testdata/complex.lc 11:29-11:43  Type
 testdata/complex.lc 11:37-11:43  Repr
 testdata/complex.lc 12:1-12:7  Float -> Float -> Complex 'Normal
 testdata/complex.lc 12:14-12:21  {a:Repr} -> Float -> Float -> Complex a
-testdata/complex.lc 12:14-12:23  Float -> Complex V1
+testdata/complex.lc 12:14-12:23  Float -> Complex b_
 testdata/complex.lc 12:14-12:25  Complex 'Normal | Float -> Complex 'Normal | Float -> Float -> Complex 'Normal
 testdata/complex.lc 12:22-12:23  Float
 testdata/complex.lc 12:24-12:25  Float
@@ -67,19 +67,19 @@ testdata/complex.lc 14:28-14:41  Type
 testdata/complex.lc 14:36-14:41  Repr
 testdata/complex.lc 15:1-15:6  Float -> Float -> Complex 'Polar
 testdata/complex.lc 15:13-15:20  {a:Repr} -> Float -> Float -> Complex a
-testdata/complex.lc 15:13-15:22  Float -> Complex V1
+testdata/complex.lc 15:13-15:22  Float -> Complex b_
 testdata/complex.lc 15:13-15:24  Complex 'Polar | Float -> Complex 'Polar | Float -> Float -> Complex 'Polar
 testdata/complex.lc 15:21-15:22  Float
 testdata/complex.lc 15:23-15:24  Float
 testdata/complex.lc 18:20-18:27  Repr->Type
 testdata/complex.lc 18:20-18:29  Type
 testdata/complex.lc 18:20-18:38  Type
-testdata/complex.lc 18:28-18:29  V1
+testdata/complex.lc 18:28-18:29  b_
 testdata/complex.lc 18:33-18:38  Type
 testdata/complex.lc 19:1-19:5  {a:Repr} -> Complex a -> Float
 testdata/complex.lc 19:34-19:38  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -> a->a
-testdata/complex.lc 19:34-19:50  Float | Float -> Float->V3 | Float->V3 | VecScalar 1 Float
-testdata/complex.lc 19:34-20:35  Complex V0 -> Float | Float | Repr->Float | {a:Repr} -> Complex a -> Float
+testdata/complex.lc 19:34-19:50  Float | Float -> Float->d_ | Float->d_ | VecScalar 1 Float
+testdata/complex.lc 19:34-20:35  Complex a_ -> Float | Float | Repr->Float | {a:Repr} -> Complex a -> Float
 testdata/complex.lc 19:40-19:41  Float
 testdata/complex.lc 19:40-19:42  Float->Float
 testdata/complex.lc 19:40-19:43  Float
@@ -93,7 +93,7 @@ testdata/complex.lc 19:46-19:48  Float->Float
 testdata/complex.lc 19:46-19:49  Float
 testdata/complex.lc 19:47-19:48  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
 testdata/complex.lc 19:48-19:49  Float
-testdata/complex.lc 20:34-20:35  Float | Float -> Float->V3 | Float->V3
+testdata/complex.lc 20:34-20:35  Float | Float -> Float->d_ | Float->d_
 testdata/complex.lc 22:12-22:19  Repr->Type
 testdata/complex.lc 22:12-22:26  Type
 testdata/complex.lc 22:20-22:26  Repr
@@ -102,7 +102,7 @@ testdata/complex.lc 22:30-22:43  Type
 testdata/complex.lc 22:38-22:43  Repr
 testdata/complex.lc 23:1-23:8  Complex 'Normal -> Complex 'Polar
 testdata/complex.lc 24:8-29:17  Complex 'Polar
-testdata/complex.lc 24:8-31:25  Complex 'Normal -> Complex 'Polar | Complex 'Polar | Float -> Float->V3 | Float->V3
+testdata/complex.lc 24:8-31:25  Complex 'Normal -> Complex 'Polar | Complex 'Polar | Float -> Float->d_ | Float->d_
 testdata/complex.lc 24:11-24:12  Float
 testdata/complex.lc 24:11-24:14  VecScalar 1 Float -> VecScalar 1 Bool
 testdata/complex.lc 24:11-24:19  VecScalar 1 Bool
@@ -254,8 +254,8 @@ testdata/complex.lc 64:30-64:44  Type
 testdata/complex.lc 64:38-64:44  Repr
 testdata/complex.lc 65:1-65:9  Complex 'Polar -> Complex 'Normal
 testdata/complex.lc 65:28-65:35  {a:Repr} -> Float -> Float -> Complex a
-testdata/complex.lc 65:28-65:49  Float -> Complex V1
-testdata/complex.lc 65:28-65:63  Complex 'Polar -> Complex 'Normal | Complex V0 | Float -> Float->V3 | Float->V3
+testdata/complex.lc 65:28-65:49  Float -> Complex b_
+testdata/complex.lc 65:28-65:63  Complex 'Polar -> Complex 'Normal | Complex a_ | Float -> Float->d_ | Float->d_
 testdata/complex.lc 65:37-65:38  Float
 testdata/complex.lc 65:37-65:40  Float->Float
 testdata/complex.lc 65:37-65:48  Float
@@ -271,23 +271,23 @@ testdata/complex.lc 65:55-65:58  {a} -> {b:Nat} -> {_ : a ~ VecScalar b Float} -
 testdata/complex.lc 65:55-65:62  VecScalar 1 Float
 testdata/complex.lc 65:59-65:62  Float
 testdata/complex.lc 111:1-111:15  {a:Repr} -> Complex a -> Float
-testdata/complex.lc 111:38-111:39  Float | Float -> Float->V3 | Float->V3
+testdata/complex.lc 111:38-111:39  Float | Float -> Float->d_ | Float->d_
 testdata/complex.lc 113:20-113:70  Type
 testdata/complex.lc 113:32-113:39  Repr->Type
 testdata/complex.lc 113:32-113:42  Type
 testdata/complex.lc 113:32-113:70  Type
-testdata/complex.lc 113:40-113:42  V3
+testdata/complex.lc 113:40-113:42  d_
 testdata/complex.lc 113:46-113:53  Repr->Type
 testdata/complex.lc 113:46-113:56  Type
 testdata/complex.lc 113:46-113:70  Type
-testdata/complex.lc 113:54-113:56  V2
+testdata/complex.lc 113:54-113:56  c_
 testdata/complex.lc 113:60-113:67  Repr->Type
 testdata/complex.lc 113:60-113:70  Type
 testdata/complex.lc 113:68-113:70  Repr
 testdata/complex.lc 114:1-114:4  {a:Repr} -> {b:Repr} -> Complex a -> Complex b -> Complex a
 testdata/complex.lc 114:53-114:60  {a:Repr} -> Float -> Float -> Complex a
-testdata/complex.lc 114:53-114:68  Float -> Complex V1
-testdata/complex.lc 114:53-114:76  Complex V0 | Complex V1 -> Complex V1 -> Complex V3 | Complex V1 -> Complex V3 | Complex V3 | Float -> Float->V3 | Float->V3 | {a:Repr} -> Complex V1 -> Complex a -> Complex V3 | {a:Repr} -> {b:Repr} -> Complex a -> Complex b -> Complex a
+testdata/complex.lc 114:53-114:68  Float -> Complex b_
+testdata/complex.lc 114:53-114:76  Complex a_ | Complex b_ -> Complex b_ -> Complex d_ | Complex b_ -> Complex d_ | Complex d_ | Float -> Float->d_ | Float->d_ | {a:Repr} -> Complex b_ -> Complex a -> Complex d_ | {a:Repr} -> {b:Repr} -> Complex a -> Complex b -> Complex a
 testdata/complex.lc 114:62-114:63  Float
 testdata/complex.lc 114:62-114:65  Float->Float
 testdata/complex.lc 114:62-114:67  Float
@@ -301,18 +301,18 @@ testdata/complex.lc 114:74-114:75  Float
 testdata/complex.lc 128:23-128:30  Repr->Type
 testdata/complex.lc 128:23-128:33  Type
 testdata/complex.lc 128:23-128:61  Type
-testdata/complex.lc 128:31-128:33  V3
+testdata/complex.lc 128:31-128:33  d_
 testdata/complex.lc 128:37-128:44  Repr->Type
 testdata/complex.lc 128:37-128:47  Type
 testdata/complex.lc 128:37-128:61  Type
-testdata/complex.lc 128:45-128:47  V2
+testdata/complex.lc 128:45-128:47  c_
 testdata/complex.lc 128:51-128:58  Repr->Type
 testdata/complex.lc 128:51-128:61  Type
 testdata/complex.lc 128:59-128:61  Repr
 testdata/complex.lc 129:1-129:4  {a:Repr} -> {b:Repr} -> Complex a -> Complex b -> Complex a
 testdata/complex.lc 129:53-129:60  {a:Repr} -> Float -> Float -> Complex a
-testdata/complex.lc 129:53-129:72  Float -> Complex V1
-testdata/complex.lc 129:53-129:84  Complex V0 | Complex V1 -> Complex V1 -> Complex V3 | Complex V1 -> Complex V3 | Complex V3 | Float -> Float->V3 | Float->V3 | {a:Repr} -> Complex V1 -> Complex a -> Complex V3 | {a:Repr} -> {b:Repr} -> Complex a -> Complex b -> Complex a
+testdata/complex.lc 129:53-129:72  Float -> Complex b_
+testdata/complex.lc 129:53-129:84  Complex a_ | Complex b_ -> Complex b_ -> Complex d_ | Complex b_ -> Complex d_ | Complex d_ | Float -> Float->d_ | Float->d_ | {a:Repr} -> Complex b_ -> Complex a -> Complex d_ | {a:Repr} -> {b:Repr} -> Complex a -> Complex b -> Complex a
 testdata/complex.lc 129:62-129:63  Float
 testdata/complex.lc 129:62-129:64  Float->Float
 testdata/complex.lc 129:62-129:65  Float
@@ -342,30 +342,30 @@ testdata/complex.lc 129:82-129:83  Float
 testdata/complex.lc 137:6-137:13  Repr->Type
 testdata/complex.lc 137:6-137:15  Type
 testdata/complex.lc 137:6-137:28  Type
-testdata/complex.lc 137:14-137:15  V1
+testdata/complex.lc 137:14-137:15  b_
 testdata/complex.lc 137:19-137:26  Repr->Type
 testdata/complex.lc 137:19-137:28  Type
 testdata/complex.lc 137:27-137:28  Repr
 testdata/complex.lc 138:1-138:2  {a:Repr} -> Complex a -> Complex a
-testdata/complex.lc 138:7-138:22  Complex V0 -> Complex V3
-testdata/complex.lc 138:7-138:24  Complex V0 -> Complex V1 | Complex V1
+testdata/complex.lc 138:7-138:22  Complex a_ -> Complex d_
+testdata/complex.lc 138:7-138:24  Complex a_ -> Complex b_ | Complex b_
 testdata/complex.lc 138:8-138:11  {a:Repr} -> {b:Repr} -> Complex a -> Complex b -> Complex a
-testdata/complex.lc 138:8-138:13  Complex V0 -> Complex V5
-testdata/complex.lc 138:8-138:15  Complex V2
-testdata/complex.lc 138:12-138:13  Complex V5
-testdata/complex.lc 138:14-138:15  Complex V3
+testdata/complex.lc 138:8-138:13  Complex a_ -> Complex f_
+testdata/complex.lc 138:8-138:15  Complex c_
+testdata/complex.lc 138:12-138:13  Complex f_
+testdata/complex.lc 138:14-138:15  Complex d_
 testdata/complex.lc 138:17-138:22  {a:Repr} -> {b:Repr} -> Complex a -> Complex b -> Complex a
-testdata/complex.lc 138:23-138:24  Complex V2
+testdata/complex.lc 138:23-138:24  Complex c_
 testdata/complex.lc 141:1-141:3  {a:Repr} -> Complex a -> Complex a
 testdata/complex.lc 141:8-141:9  {a:Repr} -> Complex a -> Complex a
-testdata/complex.lc 141:8-141:23  Complex V0
+testdata/complex.lc 141:8-141:23  Complex a_
 testdata/complex.lc 141:11-141:12  {a:Repr} -> Complex a -> Complex a
-testdata/complex.lc 141:11-141:22  Complex V0
+testdata/complex.lc 141:11-141:22  Complex a_
 testdata/complex.lc 141:14-141:15  {a:Repr} -> Complex a -> Complex a
-testdata/complex.lc 141:14-141:21  Complex V0
+testdata/complex.lc 141:14-141:21  Complex a_
 testdata/complex.lc 141:17-141:18  {a:Repr} -> Complex a -> Complex a
-testdata/complex.lc 141:17-141:20  Complex V0
-testdata/complex.lc 141:19-141:20  V5
+testdata/complex.lc 141:17-141:20  Complex a_
+testdata/complex.lc 141:19-141:20  f_
 testdata/complex.lc 143:1-143:5  {a:Repr} -> Complex a -> Complex a
 testdata/complex.lc 143:8-143:10  {a:Repr} -> Complex a -> Complex a
 testdata/complex.lc 145:1-145:7  {a:Repr} -> Complex a -> VecScalar 1 Bool
@@ -374,8 +374,8 @@ testdata/complex.lc 145:12-145:25  Float
 testdata/complex.lc 145:12-145:27  VecScalar 1 Float -> VecScalar 1 Bool
 testdata/complex.lc 145:12-145:31  VecScalar 1 Bool
 testdata/complex.lc 145:18-145:22  {a:Repr} -> Complex a -> Complex a
-testdata/complex.lc 145:18-145:24  Complex V0
-testdata/complex.lc 145:23-145:24  V6
+testdata/complex.lc 145:18-145:24  Complex a_
+testdata/complex.lc 145:23-145:24  g_
 testdata/complex.lc 145:26-145:27  {a:Nat} -> {b} -> {_ : Num b} -> VecScalar a b -> VecScalar a b -> VecScalar a Bool
 testdata/complex.lc 145:28-145:31  Float
 ------------ warnings
diff --git a/testdata/data.out b/testdata/data.out
index 7e9e79e6..4613e04f 100644
--- a/testdata/data.out
+++ b/testdata/data.out
@@ -39,7 +39,7 @@ testdata/data.lc 3:6-3:31  Type
 testdata/data.lc 3:12-3:13  Type
 testdata/data.lc 3:14-3:15  Type
 testdata/data.lc 3:16-3:17  Type
-testdata/data.lc 3:20-3:25  Data1 V6 V5 V4 | Type | {a} -> {b} -> {c} -> a -> b -> c -> Data1 a b c
+testdata/data.lc 3:20-3:25  Data1 g_ f_ e_ | Type | {a} -> {b} -> {c} -> a -> b -> c -> Data1 a b c
 testdata/data.lc 3:26-3:27  Type
 testdata/data.lc 3:28-3:29  Type
 testdata/data.lc 3:30-3:31  Type
@@ -67,16 +67,16 @@ testdata/data.lc 10:6-12:48  Type
 testdata/data.lc 10:12-10:14  Type
 testdata/data.lc 10:15-10:17  Type
 testdata/data.lc 10:18-10:20  Type
-testdata/data.lc 10:23-10:29  Data5 V4 V3 V2 | Type | {a} -> {b} -> {c} -> a -> Data5 a b c
+testdata/data.lc 10:23-10:29  Data5 e_ d_ c_ | Type | {a} -> {b} -> {c} -> a -> Data5 a b c
 testdata/data.lc 10:32-10:34  {a} -> {b} -> {c} -> Data5 a b c -> a
 testdata/data.lc 10:36-10:38  Type
-testdata/data.lc 11:23-11:29  Data5 V7 V6 V5 | Type | {a} -> {b} -> {c} -> a -> b -> c -> Data5 a b c
+testdata/data.lc 11:23-11:29  Data5 h_ g_ f_ | Type | {a} -> {b} -> {c} -> a -> b -> c -> Data5 a b c
 testdata/data.lc 11:36-11:38  Type
 testdata/data.lc 11:40-11:42  {a} -> {b} -> {c} -> Data5 a b c -> b
 testdata/data.lc 11:44-11:46  Type
 testdata/data.lc 11:48-11:50  {a} -> {b} -> {c} -> Data5 a b c -> c
 testdata/data.lc 11:52-11:54  Type
-testdata/data.lc 12:23-12:29  Data5 V10 V9 V8 | Type | {a} -> {b} -> {c} -> Int -> a -> Float -> b -> c -> Data5 a b c
+testdata/data.lc 12:23-12:29  Data5 k_ j_ i_ | Type | {a} -> {b} -> {c} -> Int -> a -> Float -> b -> c -> Data5 a b c
 testdata/data.lc 12:30-12:33  Type
 testdata/data.lc 12:34-12:36  Type
 testdata/data.lc 12:37-12:42  Type
diff --git a/testdata/framebuffer02.reject.out b/testdata/framebuffer02.reject.out
index c882e922..e5a4ab73 100644
--- a/testdata/framebuffer02.reject.out
+++ b/testdata/framebuffer02.reject.out
@@ -40,7 +40,7 @@ testdata/framebuffer02.reject.lc 3:30-3:40  {a:Nat} -> {b:Nat} -> {c} -> {d} ->
 testdata/framebuffer02.reject.lc 3:30-3:43  {a:Nat} -> {b} -> {c} -> {_ : Num b} -> {_ : c ~ VecScalar a b} -> c -> Image 2 ('Color c)
 testdata/framebuffer02.reject.lc 3:30-3:64  Image 2 ('Color (VecScalar 4 Float))
 testdata/framebuffer02.reject.lc 3:30-4:45  (Image 2 ('Color (VecScalar 4 Float)), Image 1 ('Color (VecScalar 1 Float)))
-testdata/framebuffer02.reject.lc 3:42-3:43  V1
+testdata/framebuffer02.reject.lc 3:42-3:43  b_
 testdata/framebuffer02.reject.lc 3:45-3:47  {a} -> a -> a -> a -> a -> VecS a 4
 testdata/framebuffer02.reject.lc 3:45-3:51  Float -> Float -> Float -> VecS Float 4
 testdata/framebuffer02.reject.lc 3:45-3:55  Float -> Float -> VecS Float 4
diff --git a/testdata/id.out b/testdata/id.out
index 2b014b9a..046d96cd 100644
--- a/testdata/id.out
+++ b/testdata/id.out
@@ -3,7 +3,7 @@ main is not found
 main' :: ('Float, 'Bool)
 ------------ tooltips
 testdata/id.lc 1:1-1:6  (Float, Bool)
-testdata/id.lc 3:19-3:20  V1
+testdata/id.lc 3:19-3:20  b_
 testdata/id.lc 4:8-4:27  (Float, Bool)
 testdata/id.lc 4:9-4:12  {a} -> a->a
 testdata/id.lc 4:9-4:16  Float
diff --git a/testdata/language-features/adt/gadt03.reject.out b/testdata/language-features/adt/gadt03.reject.out
index 4da95c0b..86e6efc4 100644
--- a/testdata/language-features/adt/gadt03.reject.out
+++ b/testdata/language-features/adt/gadt03.reject.out
@@ -13,7 +13,7 @@ testdata/language-features/adt/gadt03.reject.lc 2:15-2:19  Type
 testdata/language-features/adt/gadt03.reject.lc 2:24-2:30  Type
 testdata/language-features/adt/gadt03.reject.lc 2:24-2:38  Type
 testdata/language-features/adt/gadt03.reject.lc 2:34-2:38  Type
-testdata/language-features/adt/gadt03.reject.lc 3:3-3:9  M2 V3 V0 | {a} -> a -> {b:String} -> M2 a b
+testdata/language-features/adt/gadt03.reject.lc 3:3-3:9  M2 d_ a_ | {a} -> a -> {b:String} -> M2 a b
 testdata/language-features/adt/gadt03.reject.lc 3:3-3:35  Type
 testdata/language-features/adt/gadt03.reject.lc 3:13-3:14  Type
 testdata/language-features/adt/gadt03.reject.lc 3:13-3:35  Type
@@ -22,7 +22,7 @@ testdata/language-features/adt/gadt03.reject.lc 3:29-3:31  Type -> String->Type
 testdata/language-features/adt/gadt03.reject.lc 3:29-3:33  String->Type
 testdata/language-features/adt/gadt03.reject.lc 3:29-3:35  Type
 testdata/language-features/adt/gadt03.reject.lc 3:32-3:33  Type
-testdata/language-features/adt/gadt03.reject.lc 3:34-3:35  String | V1
+testdata/language-features/adt/gadt03.reject.lc 3:34-3:35  String | b_
 testdata/language-features/adt/gadt03.reject.lc 5:6-5:8  Type -> String->Type
 testdata/language-features/adt/gadt03.reject.lc 5:15-5:19  Type
 testdata/language-features/adt/gadt03.reject.lc 5:24-5:30  Type
diff --git a/testdata/language-features/adt/gadt04.reject.out b/testdata/language-features/adt/gadt04.reject.out
index 0f9e6859..02b21961 100644
--- a/testdata/language-features/adt/gadt04.reject.out
+++ b/testdata/language-features/adt/gadt04.reject.out
@@ -24,28 +24,28 @@ testdata/language-features/adt/gadt04.reject.lc 2:11-2:15  Type
 testdata/language-features/adt/gadt04.reject.lc 2:19-2:25  Type
 testdata/language-features/adt/gadt04.reject.lc 2:19-2:33  Type
 testdata/language-features/adt/gadt04.reject.lc 2:29-2:33  Type
-testdata/language-features/adt/gadt04.reject.lc 3:3-3:8  M V2 V0 | {a} -> a -> {b:String} -> M a b
+testdata/language-features/adt/gadt04.reject.lc 3:3-3:8  M c_ a_ | {a} -> a -> {b:String} -> M a b
 testdata/language-features/adt/gadt04.reject.lc 3:3-3:33  Type
-testdata/language-features/adt/gadt04.reject.lc 3:12-3:13  V1
+testdata/language-features/adt/gadt04.reject.lc 3:12-3:13  b_
 testdata/language-features/adt/gadt04.reject.lc 3:12-3:33  Type
 testdata/language-features/adt/gadt04.reject.lc 3:17-3:33  Type
 testdata/language-features/adt/gadt04.reject.lc 3:28-3:29  Type -> String->Type
 testdata/language-features/adt/gadt04.reject.lc 3:28-3:31  String->Type
 testdata/language-features/adt/gadt04.reject.lc 3:28-3:33  Type
 testdata/language-features/adt/gadt04.reject.lc 3:30-3:31  Type
-testdata/language-features/adt/gadt04.reject.lc 3:30-3:33  M V2 V0 -> Type
-testdata/language-features/adt/gadt04.reject.lc 3:32-3:33  String | V1
+testdata/language-features/adt/gadt04.reject.lc 3:30-3:33  M c_ a_ -> Type
+testdata/language-features/adt/gadt04.reject.lc 3:32-3:33  String | b_
 testdata/language-features/adt/gadt04.reject.lc 5:6-5:8  Type -> String->Type
 testdata/language-features/adt/gadt04.reject.lc 5:12-5:16  Type
 testdata/language-features/adt/gadt04.reject.lc 5:20-5:26  Type
 testdata/language-features/adt/gadt04.reject.lc 5:20-5:34  Type
 testdata/language-features/adt/gadt04.reject.lc 5:30-5:34  Type
 testdata/language-features/adt/gadt04.reject.lc 6:3-6:8  {a} -> a -> {b:String} -> M2 a b
-testdata/language-features/adt/gadt04.reject.lc 6:12-6:13  V1
+testdata/language-features/adt/gadt04.reject.lc 6:12-6:13  b_
 testdata/language-features/adt/gadt04.reject.lc 6:12-6:34  Type
 testdata/language-features/adt/gadt04.reject.lc 6:17-6:34  Type
 testdata/language-features/adt/gadt04.reject.lc 6:28-6:30  Type -> String->Type
 testdata/language-features/adt/gadt04.reject.lc 6:28-6:32  String->Type
 testdata/language-features/adt/gadt04.reject.lc 6:28-6:34  Type
 testdata/language-features/adt/gadt04.reject.lc 6:31-6:32  Type
-testdata/language-features/adt/gadt04.reject.lc 6:33-6:34  V1
+testdata/language-features/adt/gadt04.reject.lc 6:33-6:34  b_
diff --git a/testdata/language-features/basic-list/list01.out b/testdata/language-features/basic-list/list01.out
index 7ca755cd..18efaa40 100644
--- a/testdata/language-features/basic-list/list01.out
+++ b/testdata/language-features/basic-list/list01.out
@@ -7,13 +7,13 @@ value3 :: 'List 'Char
 testdata/language-features/basic-list/list01.lc 1:1-1:7  {a} -> List a
 testdata/language-features/basic-list/list01.lc 1:10-1:12  {a} -> List a
 testdata/language-features/basic-list/list01.lc 2:1-2:7  {a} -> {_ : Num a} -> List a
-testdata/language-features/basic-list/list01.lc 2:10-2:19  List V2
-testdata/language-features/basic-list/list01.lc 2:11-2:12  V1
-testdata/language-features/basic-list/list01.lc 2:13-2:14  V1
-testdata/language-features/basic-list/list01.lc 2:13-2:18  List V3
-testdata/language-features/basic-list/list01.lc 2:15-2:16  V1
-testdata/language-features/basic-list/list01.lc 2:15-2:18  List V4
-testdata/language-features/basic-list/list01.lc 2:17-2:18  List V4 | V1
+testdata/language-features/basic-list/list01.lc 2:10-2:19  List c_
+testdata/language-features/basic-list/list01.lc 2:11-2:12  b_
+testdata/language-features/basic-list/list01.lc 2:13-2:14  b_
+testdata/language-features/basic-list/list01.lc 2:13-2:18  List d_
+testdata/language-features/basic-list/list01.lc 2:15-2:16  b_
+testdata/language-features/basic-list/list01.lc 2:15-2:18  List e_
+testdata/language-features/basic-list/list01.lc 2:17-2:18  List e_ | b_
 testdata/language-features/basic-list/list01.lc 3:1-3:7  List Char
 testdata/language-features/basic-list/list01.lc 3:10-3:31  List Char
 testdata/language-features/basic-list/list01.lc 3:11-3:14  Char
diff --git a/testdata/language-features/basic-list/list02.out b/testdata/language-features/basic-list/list02.out
index 75eb0879..02f69ace 100644
--- a/testdata/language-features/basic-list/list02.out
+++ b/testdata/language-features/basic-list/list02.out
@@ -7,13 +7,13 @@ value3 :: 'List 'Char
 testdata/language-features/basic-list/list02.lc 1:1-1:7  {a} -> List a
 testdata/language-features/basic-list/list02.lc 1:10-2:4  {a} -> List a
 testdata/language-features/basic-list/list02.lc 4:1-4:7  {a} -> {_ : Num a} -> List a
-testdata/language-features/basic-list/list02.lc 4:10-5:7  List V2
-testdata/language-features/basic-list/list02.lc 4:11-4:12  V1
-testdata/language-features/basic-list/list02.lc 4:13-4:14  V1
-testdata/language-features/basic-list/list02.lc 4:13-5:6  List V3
-testdata/language-features/basic-list/list02.lc 5:3-5:4  V1
-testdata/language-features/basic-list/list02.lc 5:3-5:6  List V4
-testdata/language-features/basic-list/list02.lc 5:5-5:6  List V4 | V1
+testdata/language-features/basic-list/list02.lc 4:10-5:7  List c_
+testdata/language-features/basic-list/list02.lc 4:11-4:12  b_
+testdata/language-features/basic-list/list02.lc 4:13-4:14  b_
+testdata/language-features/basic-list/list02.lc 4:13-5:6  List d_
+testdata/language-features/basic-list/list02.lc 5:3-5:4  b_
+testdata/language-features/basic-list/list02.lc 5:3-5:6  List e_
+testdata/language-features/basic-list/list02.lc 5:5-5:6  List e_ | b_
 testdata/language-features/basic-list/list02.lc 7:1-7:7  List Char
 testdata/language-features/basic-list/list02.lc 8:3-13:4  List Char
 testdata/language-features/basic-list/list02.lc 8:5-8:8  Char
diff --git a/testdata/language-features/basic-list/list07.reject.out b/testdata/language-features/basic-list/list07.reject.out
index c9550a4f..48444536 100644
--- a/testdata/language-features/basic-list/list07.reject.out
+++ b/testdata/language-features/basic-list/list07.reject.out
@@ -14,6 +14,6 @@ with
 in builtin Nil
 
 ------------ tooltips
-testdata/language-features/basic-list/list07.reject.lc 1:10-1:11  V1
+testdata/language-features/basic-list/list07.reject.lc 1:10-1:11  b_
 testdata/language-features/basic-list/list07.reject.lc 1:12-1:15  Float
 testdata/language-features/basic-list/list07.reject.lc 1:16-1:19  Char
diff --git a/testdata/language-features/basic-list/list08.out b/testdata/language-features/basic-list/list08.out
index fb69fb70..70d5ec40 100644
--- a/testdata/language-features/basic-list/list08.out
+++ b/testdata/language-features/basic-list/list08.out
@@ -4,5 +4,5 @@ value :: 'List 'Float
 ------------ tooltips
 testdata/language-features/basic-list/list08.lc 1:1-1:6  List Float
 testdata/language-features/basic-list/list08.lc 1:9-1:16  List Float
-testdata/language-features/basic-list/list08.lc 1:10-1:11  V1
+testdata/language-features/basic-list/list08.lc 1:10-1:11  b_
 testdata/language-features/basic-list/list08.lc 1:12-1:15  Float | List Float
diff --git a/testdata/language-features/basic-list/list09.out b/testdata/language-features/basic-list/list09.out
index 4ac018ac..a9a3eefa 100644
--- a/testdata/language-features/basic-list/list09.out
+++ b/testdata/language-features/basic-list/list09.out
@@ -4,7 +4,7 @@ value :: 'List 'Float
 ------------ tooltips
 testdata/language-features/basic-list/list09.lc 1:1-1:6  List Float
 testdata/language-features/basic-list/list09.lc 1:9-1:16  List Float
-testdata/language-features/basic-list/list09.lc 1:10-1:11  V1
+testdata/language-features/basic-list/list09.lc 1:10-1:11  b_
 testdata/language-features/basic-list/list09.lc 1:12-1:15  Float | List Float
 testdata/language-features/basic-list/list09.lc 1:20-1:27  Type
 testdata/language-features/basic-list/list09.lc 1:21-1:26  Type
diff --git a/testdata/language-features/basic-list/list10.reject.out b/testdata/language-features/basic-list/list10.reject.out
index 9e9d7e6b..01484c77 100644
--- a/testdata/language-features/basic-list/list10.reject.out
+++ b/testdata/language-features/basic-list/list10.reject.out
@@ -14,7 +14,7 @@ with
 in builtin Nil
 
 ------------ tooltips
-testdata/language-features/basic-list/list10.reject.lc 1:10-1:11  V1
+testdata/language-features/basic-list/list10.reject.lc 1:10-1:11  b_
 testdata/language-features/basic-list/list10.reject.lc 1:12-1:15  Float
 testdata/language-features/basic-list/list10.reject.lc 1:20-1:25  Type
 testdata/language-features/basic-list/list10.reject.lc 1:21-1:24  Type
diff --git a/testdata/language-features/basic-list/list11.out b/testdata/language-features/basic-list/list11.out
index 39d4c7a8..659a85eb 100644
--- a/testdata/language-features/basic-list/list11.out
+++ b/testdata/language-features/basic-list/list11.out
@@ -3,8 +3,8 @@ main is not found
 value :: {a} -> {_ : 'Num a} -> 'List a
 ------------ tooltips
 testdata/language-features/basic-list/list11.lc 1:1-1:6  {a} -> {_ : Num a} -> List a
-testdata/language-features/basic-list/list11.lc 1:9-1:10  V1
-testdata/language-features/basic-list/list11.lc 1:9-1:11  List V1 -> List V2
-testdata/language-features/basic-list/list11.lc 1:9-1:13  List V1
+testdata/language-features/basic-list/list11.lc 1:9-1:10  b_
+testdata/language-features/basic-list/list11.lc 1:9-1:11  List b_ -> List c_
+testdata/language-features/basic-list/list11.lc 1:9-1:13  List b_
 testdata/language-features/basic-list/list11.lc 1:10-1:11  {a} -> a -> List a -> List a
 testdata/language-features/basic-list/list11.lc 1:11-1:13  {a} -> List a
diff --git a/testdata/language-features/basic-list/list12.out b/testdata/language-features/basic-list/list12.out
index b9cb6a29..83ceff3c 100644
--- a/testdata/language-features/basic-list/list12.out
+++ b/testdata/language-features/basic-list/list12.out
@@ -3,24 +3,24 @@ main is not found
 value :: {a} -> {_ : 'Num a} -> 'List a
 ------------ tooltips
 testdata/language-features/basic-list/list12.lc 1:1-1:6  {a} -> {_ : Num a} -> List a
-testdata/language-features/basic-list/list12.lc 1:9-1:10  V1
-testdata/language-features/basic-list/list12.lc 1:9-1:11  List V1 -> List V2
-testdata/language-features/basic-list/list12.lc 1:9-1:21  List V2
+testdata/language-features/basic-list/list12.lc 1:9-1:10  b_
+testdata/language-features/basic-list/list12.lc 1:9-1:11  List b_ -> List c_
+testdata/language-features/basic-list/list12.lc 1:9-1:21  List c_
 testdata/language-features/basic-list/list12.lc 1:10-1:11  {a} -> a -> List a -> List a
-testdata/language-features/basic-list/list12.lc 1:11-1:12  V1
-testdata/language-features/basic-list/list12.lc 1:11-1:13  List V1 -> List V2
-testdata/language-features/basic-list/list12.lc 1:11-1:21  List V3
+testdata/language-features/basic-list/list12.lc 1:11-1:12  b_
+testdata/language-features/basic-list/list12.lc 1:11-1:13  List b_ -> List c_
+testdata/language-features/basic-list/list12.lc 1:11-1:21  List d_
 testdata/language-features/basic-list/list12.lc 1:12-1:13  {a} -> a -> List a -> List a
-testdata/language-features/basic-list/list12.lc 1:13-1:14  V1
-testdata/language-features/basic-list/list12.lc 1:13-1:15  List V1 -> List V2
-testdata/language-features/basic-list/list12.lc 1:13-1:21  List V4
+testdata/language-features/basic-list/list12.lc 1:13-1:14  b_
+testdata/language-features/basic-list/list12.lc 1:13-1:15  List b_ -> List c_
+testdata/language-features/basic-list/list12.lc 1:13-1:21  List e_
 testdata/language-features/basic-list/list12.lc 1:14-1:15  {a} -> a -> List a -> List a
-testdata/language-features/basic-list/list12.lc 1:15-1:16  V1
-testdata/language-features/basic-list/list12.lc 1:15-1:17  List V1 -> List V2
-testdata/language-features/basic-list/list12.lc 1:15-1:21  List V5
+testdata/language-features/basic-list/list12.lc 1:15-1:16  b_
+testdata/language-features/basic-list/list12.lc 1:15-1:17  List b_ -> List c_
+testdata/language-features/basic-list/list12.lc 1:15-1:21  List f_
 testdata/language-features/basic-list/list12.lc 1:16-1:17  {a} -> a -> List a -> List a
-testdata/language-features/basic-list/list12.lc 1:17-1:18  V1
-testdata/language-features/basic-list/list12.lc 1:17-1:19  List V1 -> List V2
-testdata/language-features/basic-list/list12.lc 1:17-1:21  List V5
+testdata/language-features/basic-list/list12.lc 1:17-1:18  b_
+testdata/language-features/basic-list/list12.lc 1:17-1:19  List b_ -> List c_
+testdata/language-features/basic-list/list12.lc 1:17-1:21  List f_
 testdata/language-features/basic-list/list12.lc 1:18-1:19  {a} -> a -> List a -> List a
 testdata/language-features/basic-list/list12.lc 1:19-1:21  {a} -> List a
diff --git a/testdata/language-features/basic-list/listcomp01.out b/testdata/language-features/basic-list/listcomp01.out
index f4b09c23..d361c85d 100644
--- a/testdata/language-features/basic-list/listcomp01.out
+++ b/testdata/language-features/basic-list/listcomp01.out
@@ -4,7 +4,7 @@ value :: 'List ()
 ------------ tooltips
 testdata/language-features/basic-list/listcomp01.lc 1:1-1:6  List ()
 testdata/language-features/basic-list/listcomp01.lc 1:9-1:34  List ()
-testdata/language-features/basic-list/listcomp01.lc 1:10-1:12  () | List () | V1 -> List V1
+testdata/language-features/basic-list/listcomp01.lc 1:10-1:12  () | List () | b_ -> List b_
 testdata/language-features/basic-list/listcomp01.lc 1:20-1:33  List ()
 testdata/language-features/basic-list/listcomp01.lc 1:21-1:23  ()
 testdata/language-features/basic-list/listcomp01.lc 1:24-1:26  ()
diff --git a/testdata/language-features/basic-list/listcomp02.out b/testdata/language-features/basic-list/listcomp02.out
index 10c95e36..29c0d611 100644
--- a/testdata/language-features/basic-list/listcomp02.out
+++ b/testdata/language-features/basic-list/listcomp02.out
@@ -13,5 +13,5 @@ testdata/language-features/basic-list/listcomp02.lc 1:12-1:17  List ()
 testdata/language-features/basic-list/listcomp02.lc 1:15-1:17  () | List ()
 testdata/language-features/basic-list/listcomp02.lc 2:1-2:6  List ()
 testdata/language-features/basic-list/listcomp02.lc 2:9-2:21  List ()
-testdata/language-features/basic-list/listcomp02.lc 2:10-2:11  List V1 | V1 -> List V1 | V3
+testdata/language-features/basic-list/listcomp02.lc 2:10-2:11  List b_ | b_ -> List b_ | d_
 testdata/language-features/basic-list/listcomp02.lc 2:19-2:20  List ()
diff --git a/testdata/language-features/basic-list/listcomp03.out b/testdata/language-features/basic-list/listcomp03.out
index 045f77e2..44f90d26 100644
--- a/testdata/language-features/basic-list/listcomp03.out
+++ b/testdata/language-features/basic-list/listcomp03.out
@@ -5,7 +5,7 @@ value :: 'List ()
 testdata/language-features/basic-list/listcomp03.lc 1:1-1:6  List ()
 testdata/language-features/basic-list/listcomp03.lc 1:9-1:41  List ()
 testdata/language-features/basic-list/listcomp03.lc 1:10-1:12  () | List ()
-testdata/language-features/basic-list/listcomp03.lc 1:10-1:40  List () | List () -> List () | V1 -> List V1
+testdata/language-features/basic-list/listcomp03.lc 1:10-1:40  List () | List () -> List () | b_ -> List b_
 testdata/language-features/basic-list/listcomp03.lc 1:20-1:33  List ()
 testdata/language-features/basic-list/listcomp03.lc 1:21-1:23  ()
 testdata/language-features/basic-list/listcomp03.lc 1:24-1:26  ()
diff --git a/testdata/language-features/basic-list/listcomp04.out b/testdata/language-features/basic-list/listcomp04.out
index 66fd3225..a013a9e7 100644
--- a/testdata/language-features/basic-list/listcomp04.out
+++ b/testdata/language-features/basic-list/listcomp04.out
@@ -13,7 +13,7 @@ testdata/language-features/basic-list/listcomp04.lc 1:12-1:17  List ()
 testdata/language-features/basic-list/listcomp04.lc 1:15-1:17  () | List ()
 testdata/language-features/basic-list/listcomp04.lc 2:1-2:6  List ()
 testdata/language-features/basic-list/listcomp04.lc 2:9-2:30  List ()
-testdata/language-features/basic-list/listcomp04.lc 2:10-2:12  () | List () | V1 -> List V1
-testdata/language-features/basic-list/listcomp04.lc 2:10-2:29  List () | V1 -> List V1
+testdata/language-features/basic-list/listcomp04.lc 2:10-2:12  () | List () | b_ -> List b_
+testdata/language-features/basic-list/listcomp04.lc 2:10-2:29  List () | b_ -> List b_
 testdata/language-features/basic-list/listcomp04.lc 2:20-2:21  List ()
 testdata/language-features/basic-list/listcomp04.lc 2:28-2:29  List ()
diff --git a/testdata/language-features/basic-list/listcomp05.out b/testdata/language-features/basic-list/listcomp05.out
index abfe2a32..8b16597b 100644
--- a/testdata/language-features/basic-list/listcomp05.out
+++ b/testdata/language-features/basic-list/listcomp05.out
@@ -5,9 +5,9 @@ value :: 'List ()
 testdata/language-features/basic-list/listcomp05.lc 1:1-1:6  List ()
 testdata/language-features/basic-list/listcomp05.lc 1:9-1:39  List ()
 testdata/language-features/basic-list/listcomp05.lc 1:10-1:11  ()
-testdata/language-features/basic-list/listcomp05.lc 1:10-1:38  V1 -> List V1
+testdata/language-features/basic-list/listcomp05.lc 1:10-1:38  b_ -> List b_
 testdata/language-features/basic-list/listcomp05.lc 1:19-1:26  List ()
 testdata/language-features/basic-list/listcomp05.lc 1:20-1:22  ()
 testdata/language-features/basic-list/listcomp05.lc 1:23-1:25  () | List ()
-testdata/language-features/basic-list/listcomp05.lc 1:32-1:33  () | V1
+testdata/language-features/basic-list/listcomp05.lc 1:32-1:33  () | b_
 testdata/language-features/basic-list/listcomp05.lc 1:36-1:38  ()
diff --git a/testdata/language-features/basic-list/listcomp06.out b/testdata/language-features/basic-list/listcomp06.out
index 9d0bbbcd..fef46590 100644
--- a/testdata/language-features/basic-list/listcomp06.out
+++ b/testdata/language-features/basic-list/listcomp06.out
@@ -6,20 +6,20 @@ value2 :: 'List ()
 testdata/language-features/basic-list/listcomp06.lc 1:1-1:7  List ()
 testdata/language-features/basic-list/listcomp06.lc 1:10-1:46  List ()
 testdata/language-features/basic-list/listcomp06.lc 1:11-1:12  () | List ()
-testdata/language-features/basic-list/listcomp06.lc 1:11-1:45  List () -> List () | V1 -> List V1
+testdata/language-features/basic-list/listcomp06.lc 1:11-1:45  List () -> List () | b_ -> List b_
 testdata/language-features/basic-list/listcomp06.lc 1:20-1:27  List ()
 testdata/language-features/basic-list/listcomp06.lc 1:21-1:23  ()
 testdata/language-features/basic-list/listcomp06.lc 1:24-1:26  () | List ()
-testdata/language-features/basic-list/listcomp06.lc 1:33-1:34  () | V1
+testdata/language-features/basic-list/listcomp06.lc 1:33-1:34  () | b_
 testdata/language-features/basic-list/listcomp06.lc 1:37-1:39  ()
 testdata/language-features/basic-list/listcomp06.lc 1:41-1:45  Bool
 testdata/language-features/basic-list/listcomp06.lc 3:1-3:7  List ()
 testdata/language-features/basic-list/listcomp06.lc 3:10-3:46  List ()
 testdata/language-features/basic-list/listcomp06.lc 3:11-3:12  ()
-testdata/language-features/basic-list/listcomp06.lc 3:11-3:45  List () | V1 -> List V1
+testdata/language-features/basic-list/listcomp06.lc 3:11-3:45  List () | b_ -> List b_
 testdata/language-features/basic-list/listcomp06.lc 3:20-3:27  List ()
 testdata/language-features/basic-list/listcomp06.lc 3:21-3:23  ()
 testdata/language-features/basic-list/listcomp06.lc 3:24-3:26  () | List ()
 testdata/language-features/basic-list/listcomp06.lc 3:29-3:33  Bool
-testdata/language-features/basic-list/listcomp06.lc 3:39-3:40  () | V1
+testdata/language-features/basic-list/listcomp06.lc 3:39-3:40  () | b_
 testdata/language-features/basic-list/listcomp06.lc 3:43-3:45  ()
diff --git a/testdata/language-features/basic-list/listcomp07.out b/testdata/language-features/basic-list/listcomp07.out
index fa9a6239..dad2ff25 100644
--- a/testdata/language-features/basic-list/listcomp07.out
+++ b/testdata/language-features/basic-list/listcomp07.out
@@ -7,36 +7,36 @@ value3 :: 'List ()
 testdata/language-features/basic-list/listcomp07.lc 1:1-1:7  List ()
 testdata/language-features/basic-list/listcomp07.lc 1:10-6:11  List ()
 testdata/language-features/basic-list/listcomp07.lc 1:12-1:13  ()
-testdata/language-features/basic-list/listcomp07.lc 1:12-5:21  V1 -> List V1
+testdata/language-features/basic-list/listcomp07.lc 1:12-5:21  b_ -> List b_
 testdata/language-features/basic-list/listcomp07.lc 2:17-2:24  List ()
 testdata/language-features/basic-list/listcomp07.lc 2:18-2:20  ()
 testdata/language-features/basic-list/listcomp07.lc 2:21-2:23  () | List ()
-testdata/language-features/basic-list/listcomp07.lc 3:16-3:17  () | V1
+testdata/language-features/basic-list/listcomp07.lc 3:16-3:17  () | b_
 testdata/language-features/basic-list/listcomp07.lc 3:20-3:22  ()
 testdata/language-features/basic-list/listcomp07.lc 4:12-4:16  Bool
-testdata/language-features/basic-list/listcomp07.lc 5:16-5:17  () | V1
+testdata/language-features/basic-list/listcomp07.lc 5:16-5:17  () | b_
 testdata/language-features/basic-list/listcomp07.lc 5:20-5:21  ()
 testdata/language-features/basic-list/listcomp07.lc 8:1-8:7  List ()
 testdata/language-features/basic-list/listcomp07.lc 8:10-12:11  List ()
 testdata/language-features/basic-list/listcomp07.lc 8:12-8:13  ()
-testdata/language-features/basic-list/listcomp07.lc 8:12-11:21  V1 -> List V1
+testdata/language-features/basic-list/listcomp07.lc 8:12-11:21  b_ -> List b_
 testdata/language-features/basic-list/listcomp07.lc 8:21-8:28  List ()
 testdata/language-features/basic-list/listcomp07.lc 8:22-8:24  ()
 testdata/language-features/basic-list/listcomp07.lc 8:25-8:27  () | List ()
-testdata/language-features/basic-list/listcomp07.lc 9:16-9:17  () | V1
+testdata/language-features/basic-list/listcomp07.lc 9:16-9:17  () | b_
 testdata/language-features/basic-list/listcomp07.lc 9:20-9:22  ()
 testdata/language-features/basic-list/listcomp07.lc 10:12-10:16  Bool
-testdata/language-features/basic-list/listcomp07.lc 11:16-11:17  () | V1
+testdata/language-features/basic-list/listcomp07.lc 11:16-11:17  () | b_
 testdata/language-features/basic-list/listcomp07.lc 11:20-11:21  ()
 testdata/language-features/basic-list/listcomp07.lc 14:1-14:7  List ()
 testdata/language-features/basic-list/listcomp07.lc 14:10-20:3  List ()
 testdata/language-features/basic-list/listcomp07.lc 14:12-14:13  ()
-testdata/language-features/basic-list/listcomp07.lc 14:12-19:15  V1 -> List V1
+testdata/language-features/basic-list/listcomp07.lc 14:12-19:15  b_ -> List b_
 testdata/language-features/basic-list/listcomp07.lc 15:15-15:22  List ()
 testdata/language-features/basic-list/listcomp07.lc 15:16-15:18  ()
 testdata/language-features/basic-list/listcomp07.lc 15:19-15:21  () | List ()
-testdata/language-features/basic-list/listcomp07.lc 17:2-17:3  () | V1
+testdata/language-features/basic-list/listcomp07.lc 17:2-17:3  () | b_
 testdata/language-features/basic-list/listcomp07.lc 17:6-17:8  ()
 testdata/language-features/basic-list/listcomp07.lc 18:7-18:11  Bool
-testdata/language-features/basic-list/listcomp07.lc 19:10-19:11  () | V1
+testdata/language-features/basic-list/listcomp07.lc 19:10-19:11  () | b_
 testdata/language-features/basic-list/listcomp07.lc 19:14-19:15  ()
diff --git a/testdata/language-features/basic-list/listcomp08.reject.out b/testdata/language-features/basic-list/listcomp08.reject.out
index 4eae6c46..f5f8f488 100644
--- a/testdata/language-features/basic-list/listcomp08.reject.out
+++ b/testdata/language-features/basic-list/listcomp08.reject.out
@@ -18,5 +18,5 @@ value = [x | x <- [], "not Bool"]
                       ^^^^^^^^^^
 
 ------------ tooltips
-testdata/language-features/basic-list/listcomp08.reject.lc 1:10-1:33  V1 -> List V1
+testdata/language-features/basic-list/listcomp08.reject.lc 1:10-1:33  b_ -> List b_
 testdata/language-features/basic-list/listcomp08.reject.lc 1:23-1:33  String
diff --git a/testdata/language-features/basic-list/listcomp09.out b/testdata/language-features/basic-list/listcomp09.out
index 00bc6cb8..fa57c421 100644
--- a/testdata/language-features/basic-list/listcomp09.out
+++ b/testdata/language-features/basic-list/listcomp09.out
@@ -4,6 +4,6 @@ value1 :: {_} -> 'List ()->'String
 ------------ tooltips
 testdata/language-features/basic-list/listcomp09.lc 1:1-1:7  {_} -> List ()->String
 testdata/language-features/basic-list/listcomp09.lc 1:10-1:36  List ()->String
-testdata/language-features/basic-list/listcomp09.lc 1:11-1:25  List ()->String | V1 -> List V1
+testdata/language-features/basic-list/listcomp09.lc 1:11-1:25  List ()->String | b_ -> List b_
 testdata/language-features/basic-list/listcomp09.lc 1:18-1:25  String
 testdata/language-features/basic-list/listcomp09.lc 1:33-1:35  {a} -> List a
diff --git a/testdata/language-features/basic-values/case02.out b/testdata/language-features/basic-values/case02.out
index 9d790c66..b6d80b67 100644
--- a/testdata/language-features/basic-values/case02.out
+++ b/testdata/language-features/basic-values/case02.out
@@ -5,13 +5,13 @@ value2 :: {a} -> {_ : 'Eq a} -> {_ : 'Num a} -> {_ : 'Eq a} -> {_ : 'Num a}
 ------------ tooltips
 testdata/language-features/basic-values/case02.lc 1:1-1:7  {a} -> {_ : Eq a} -> {_ : Num a}->()
 testdata/language-features/basic-values/case02.lc 1:10-3:10  ()
-testdata/language-features/basic-values/case02.lc 1:15-1:16  V1
+testdata/language-features/basic-values/case02.lc 1:15-1:16  b_
 testdata/language-features/basic-values/case02.lc 2:8-2:10  ()
 testdata/language-features/basic-values/case02.lc 2:8-3:10  Bool->()
 testdata/language-features/basic-values/case02.lc 3:8-3:10  ()
 testdata/language-features/basic-values/case02.lc 5:1-5:7  {a} -> {_ : Eq a} -> {_ : Num a} -> {_ : Eq a} -> {_ : Num a}->String
 testdata/language-features/basic-values/case02.lc 5:10-8:11  String
-testdata/language-features/basic-values/case02.lc 5:15-5:16  V1
+testdata/language-features/basic-values/case02.lc 5:15-5:16  b_
 testdata/language-features/basic-values/case02.lc 6:8-6:11  String
 testdata/language-features/basic-values/case02.lc 6:8-8:11  Bool->String
 testdata/language-features/basic-values/case02.lc 7:8-7:11  String
diff --git a/testdata/language-features/basic-values/case05.out b/testdata/language-features/basic-values/case05.out
index c21097aa..40113fde 100644
--- a/testdata/language-features/basic-values/case05.out
+++ b/testdata/language-features/basic-values/case05.out
@@ -4,12 +4,12 @@ value :: {a} -> {_ : 'Eq a} -> {_ : 'Num a} -> a->'Char
 ------------ tooltips
 testdata/language-features/basic-values/case05.lc 1:1-1:6  {a} -> {_ : Eq a} -> {_ : Num a} -> a->Char
 testdata/language-features/basic-values/case05.lc 1:11-2:11  Char
-testdata/language-features/basic-values/case05.lc 1:16-1:17  V4
+testdata/language-features/basic-values/case05.lc 1:16-1:17  e_
 testdata/language-features/basic-values/case05.lc 2:8-2:11  Char
 ------------ warnings
 Uncovered pattern(s) at testdata/language-features/basic-values/case05.lc:1:16:
 value x = case x of
                ^
 Missing case(s):
-  _ | False <- == (fromInt 1) V0
+  _ | False <- == (fromInt 1) a_
 
diff --git a/testdata/language-features/basic-values/case06.out b/testdata/language-features/basic-values/case06.out
index 3a878653..a4959bfe 100644
--- a/testdata/language-features/basic-values/case06.out
+++ b/testdata/language-features/basic-values/case06.out
@@ -4,7 +4,7 @@ value :: {a} -> {_ : 'Eq a} -> {_ : 'Num a} -> a->'Char
 ------------ tooltips
 testdata/language-features/basic-values/case06.lc 1:1-1:6  {a} -> {_ : Eq a} -> {_ : Num a} -> a->Char
 testdata/language-features/basic-values/case06.lc 1:11-3:11  Char
-testdata/language-features/basic-values/case06.lc 1:16-1:17  V4
+testdata/language-features/basic-values/case06.lc 1:16-1:17  e_
 testdata/language-features/basic-values/case06.lc 2:8-2:11  Char
 testdata/language-features/basic-values/case06.lc 2:8-3:11  Bool->Char
 testdata/language-features/basic-values/case06.lc 3:8-3:11  Char
diff --git a/testdata/language-features/basic-values/def01.out b/testdata/language-features/basic-values/def01.out
index 89a11da3..1bec17b3 100644
--- a/testdata/language-features/basic-values/def01.out
+++ b/testdata/language-features/basic-values/def01.out
@@ -7,6 +7,6 @@ fun2 :: {a} -> {b} -> {c} -> {d} -> {e} -> a -> b -> c -> d -> e->'Char[39
 testdata/language-features/basic-values/def01.lc 1:1-1:5  ()
 testdata/language-features/basic-values/def01.lc 1:8-1:10  ()
 testdata/language-features/basic-values/def01.lc 3:1-3:5  {a} -> {b} -> {_ : Num b} -> a->b
-testdata/language-features/basic-values/def01.lc 3:10-3:11  V1
+testdata/language-features/basic-values/def01.lc 3:10-3:11  b_
 testdata/language-features/basic-values/def01.lc 5:1-5:5  {a} -> {b} -> {c} -> {d} -> {e} -> a -> b -> c -> d -> e->Char
 testdata/language-features/basic-values/def01.lc 5:18-5:21  Char
diff --git a/testdata/language-features/basic-values/def03.out b/testdata/language-features/basic-values/def03.out
index ad9a38d6..6a383d9c 100644
--- a/testdata/language-features/basic-values/def03.out
+++ b/testdata/language-features/basic-values/def03.out
@@ -11,5 +11,5 @@ Uncovered pattern(s) at testdata/language-features/basic-values/def03.lc:1:1:
 fun 1 = '1'
 fun 2 = '2'
 Missing case(s):
-  _ | False <- == (fromInt 1) V0, False <- == (fromInt 2) V0
+  _ | False <- == (fromInt 1) a_, False <- == (fromInt 2) a_
 
diff --git a/testdata/language-features/basic-values/def07.reject.out b/testdata/language-features/basic-values/def07.reject.out
index 16a8195b..ecd42e2a 100644
--- a/testdata/language-features/basic-values/def07.reject.out
+++ b/testdata/language-features/basic-values/def07.reject.out
@@ -28,11 +28,11 @@ Uncovered pattern(s) at testdata/language-features/basic-values/def07.reject.lc:
 fun 1 = '1'
 fun 2 = '2'
 Missing case(s):
-  _ | False <- == (fromInt 1) V0, False <- == (fromInt 2) V0
+  _ | False <- == (fromInt 1) a_, False <- == (fromInt 2) a_
 
 Uncovered pattern(s) at testdata/language-features/basic-values/def07.reject.lc:3:1:
 fun2 1 _ = '1'
 ^^^^
 Missing case(s):
-  _ _ | False <- == (fromInt 1) V1
+  _ _ | False <- == (fromInt 1) b_
 
diff --git a/testdata/language-features/basic-values/fixity01.out b/testdata/language-features/basic-values/fixity01.out
index eb0e5fc2..56d4a7db 100644
--- a/testdata/language-features/basic-values/fixity01.out
+++ b/testdata/language-features/basic-values/fixity01.out
@@ -6,10 +6,10 @@ funR :: {a} -> {b} -> a -> b->a
 >>>> :: {a} -> {b} -> a -> b->b
 ------------ tooltips
 testdata/language-features/basic-values/fixity01.lc 1:1-1:5  {a} -> {b} -> a -> b->a
-testdata/language-features/basic-values/fixity01.lc 1:12-1:13  V3
+testdata/language-features/basic-values/fixity01.lc 1:12-1:13  d_
 testdata/language-features/basic-values/fixity01.lc 2:1-2:5  {a} -> {b} -> a -> b->a
-testdata/language-features/basic-values/fixity01.lc 2:12-2:13  V3
+testdata/language-features/basic-values/fixity01.lc 2:12-2:13  d_
 testdata/language-features/basic-values/fixity01.lc 4:3-4:7  {a} -> {b} -> a -> b->a
-testdata/language-features/basic-values/fixity01.lc 4:12-4:13  V3
+testdata/language-features/basic-values/fixity01.lc 4:12-4:13  d_
 testdata/language-features/basic-values/fixity01.lc 5:3-5:7  {a} -> {b} -> a -> b->b
-testdata/language-features/basic-values/fixity01.lc 5:12-5:13  V1
+testdata/language-features/basic-values/fixity01.lc 5:12-5:13  b_
diff --git a/testdata/language-features/basic-values/fixity02.out b/testdata/language-features/basic-values/fixity02.out
index ef3914b9..0b15ed06 100644
--- a/testdata/language-features/basic-values/fixity02.out
+++ b/testdata/language-features/basic-values/fixity02.out
@@ -22,37 +22,37 @@ funValue7 :: 'String
 funValue8 :: ()
 ------------ tooltips
 testdata/language-features/basic-values/fixity02.lc 1:1-1:5  {a} -> {b} -> a -> b->a
-testdata/language-features/basic-values/fixity02.lc 1:12-1:13  V3
+testdata/language-features/basic-values/fixity02.lc 1:12-1:13  d_
 testdata/language-features/basic-values/fixity02.lc 2:1-2:5  {a} -> {b} -> a -> b->b
-testdata/language-features/basic-values/fixity02.lc 2:12-2:13  V1
+testdata/language-features/basic-values/fixity02.lc 2:12-2:13  b_
 testdata/language-features/basic-values/fixity02.lc 4:3-4:5  {a} -> {b} -> a -> b->a
-testdata/language-features/basic-values/fixity02.lc 4:10-4:11  V3
+testdata/language-features/basic-values/fixity02.lc 4:10-4:11  d_
 testdata/language-features/basic-values/fixity02.lc 5:3-5:5  {a} -> {b} -> a -> b->b
-testdata/language-features/basic-values/fixity02.lc 5:10-5:11  V1
+testdata/language-features/basic-values/fixity02.lc 5:10-5:11  b_
 testdata/language-features/basic-values/fixity02.lc 11:1-11:7  Float
 testdata/language-features/basic-values/fixity02.lc 11:10-11:12  ()
-testdata/language-features/basic-values/fixity02.lc 11:10-11:15  V0->V1
+testdata/language-features/basic-values/fixity02.lc 11:10-11:15  a_->b_
 testdata/language-features/basic-values/fixity02.lc 11:10-11:34  Float
 testdata/language-features/basic-values/fixity02.lc 11:13-11:15  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 11:16-11:19  Char
-testdata/language-features/basic-values/fixity02.lc 11:16-11:22  V0->V1
+testdata/language-features/basic-values/fixity02.lc 11:16-11:22  a_->b_
 testdata/language-features/basic-values/fixity02.lc 11:16-11:34  Float
 testdata/language-features/basic-values/fixity02.lc 11:20-11:22  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 11:23-11:27  String
-testdata/language-features/basic-values/fixity02.lc 11:23-11:30  V0->V1
+testdata/language-features/basic-values/fixity02.lc 11:23-11:30  a_->b_
 testdata/language-features/basic-values/fixity02.lc 11:23-11:34  Float
 testdata/language-features/basic-values/fixity02.lc 11:28-11:30  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 11:31-11:34  Float
 testdata/language-features/basic-values/fixity02.lc 11:38-11:43  Type
 testdata/language-features/basic-values/fixity02.lc 12:1-12:7  Float
 testdata/language-features/basic-values/fixity02.lc 12:10-12:12  ()
-testdata/language-features/basic-values/fixity02.lc 12:10-12:15  V0->V1
+testdata/language-features/basic-values/fixity02.lc 12:10-12:15  a_->b_
 testdata/language-features/basic-values/fixity02.lc 12:10-12:34  Float
 testdata/language-features/basic-values/fixity02.lc 12:13-12:15  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 12:16-12:19  Char
-testdata/language-features/basic-values/fixity02.lc 12:16-12:22  V0->Char
+testdata/language-features/basic-values/fixity02.lc 12:16-12:22  a_->Char
 testdata/language-features/basic-values/fixity02.lc 12:16-12:27  Char
-testdata/language-features/basic-values/fixity02.lc 12:16-12:30  V0->V1
+testdata/language-features/basic-values/fixity02.lc 12:16-12:30  a_->b_
 testdata/language-features/basic-values/fixity02.lc 12:16-12:34  Float
 testdata/language-features/basic-values/fixity02.lc 12:20-12:22  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 12:23-12:27  String
@@ -61,28 +61,28 @@ testdata/language-features/basic-values/fixity02.lc 12:31-12:34  Float
 testdata/language-features/basic-values/fixity02.lc 12:38-12:43  Type
 testdata/language-features/basic-values/fixity02.lc 13:1-13:7  Float
 testdata/language-features/basic-values/fixity02.lc 13:10-13:12  ()
-testdata/language-features/basic-values/fixity02.lc 13:10-13:15  V0->()
+testdata/language-features/basic-values/fixity02.lc 13:10-13:15  a_->()
 testdata/language-features/basic-values/fixity02.lc 13:10-13:19  ()
-testdata/language-features/basic-values/fixity02.lc 13:10-13:22  V0->V1
+testdata/language-features/basic-values/fixity02.lc 13:10-13:22  a_->b_
 testdata/language-features/basic-values/fixity02.lc 13:10-13:34  Float
 testdata/language-features/basic-values/fixity02.lc 13:13-13:15  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 13:16-13:19  Char
 testdata/language-features/basic-values/fixity02.lc 13:20-13:22  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 13:23-13:27  String
-testdata/language-features/basic-values/fixity02.lc 13:23-13:30  V0->V1
+testdata/language-features/basic-values/fixity02.lc 13:23-13:30  a_->b_
 testdata/language-features/basic-values/fixity02.lc 13:23-13:34  Float
 testdata/language-features/basic-values/fixity02.lc 13:28-13:30  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 13:31-13:34  Float
 testdata/language-features/basic-values/fixity02.lc 13:38-13:43  Type
 testdata/language-features/basic-values/fixity02.lc 14:1-14:7  Float
 testdata/language-features/basic-values/fixity02.lc 14:10-14:12  ()
-testdata/language-features/basic-values/fixity02.lc 14:10-14:15  V0->()
+testdata/language-features/basic-values/fixity02.lc 14:10-14:15  a_->()
 testdata/language-features/basic-values/fixity02.lc 14:10-14:27  ()
-testdata/language-features/basic-values/fixity02.lc 14:10-14:30  V0->V1
+testdata/language-features/basic-values/fixity02.lc 14:10-14:30  a_->b_
 testdata/language-features/basic-values/fixity02.lc 14:10-14:34  Float
 testdata/language-features/basic-values/fixity02.lc 14:13-14:15  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 14:16-14:19  Char
-testdata/language-features/basic-values/fixity02.lc 14:16-14:22  V0->Char
+testdata/language-features/basic-values/fixity02.lc 14:16-14:22  a_->Char
 testdata/language-features/basic-values/fixity02.lc 14:16-14:27  Char
 testdata/language-features/basic-values/fixity02.lc 14:20-14:22  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 14:23-14:27  String
@@ -91,88 +91,88 @@ testdata/language-features/basic-values/fixity02.lc 14:31-14:34  Float
 testdata/language-features/basic-values/fixity02.lc 14:38-14:43  Type
 testdata/language-features/basic-values/fixity02.lc 15:1-15:7  String
 testdata/language-features/basic-values/fixity02.lc 15:10-15:12  ()
-testdata/language-features/basic-values/fixity02.lc 15:10-15:15  V0->V1
+testdata/language-features/basic-values/fixity02.lc 15:10-15:15  a_->b_
 testdata/language-features/basic-values/fixity02.lc 15:10-15:34  String
 testdata/language-features/basic-values/fixity02.lc 15:13-15:15  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 15:16-15:19  Char
-testdata/language-features/basic-values/fixity02.lc 15:16-15:22  V0->V1
+testdata/language-features/basic-values/fixity02.lc 15:16-15:22  a_->b_
 testdata/language-features/basic-values/fixity02.lc 15:16-15:34  String
 testdata/language-features/basic-values/fixity02.lc 15:20-15:22  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 15:23-15:27  String
-testdata/language-features/basic-values/fixity02.lc 15:23-15:30  V0->String
+testdata/language-features/basic-values/fixity02.lc 15:23-15:30  a_->String
 testdata/language-features/basic-values/fixity02.lc 15:23-15:34  String
 testdata/language-features/basic-values/fixity02.lc 15:28-15:30  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 15:31-15:34  Float
 testdata/language-features/basic-values/fixity02.lc 15:38-15:44  Type
 testdata/language-features/basic-values/fixity02.lc 16:1-16:7  Char
 testdata/language-features/basic-values/fixity02.lc 16:10-16:12  ()
-testdata/language-features/basic-values/fixity02.lc 16:10-16:15  V0->V1
+testdata/language-features/basic-values/fixity02.lc 16:10-16:15  a_->b_
 testdata/language-features/basic-values/fixity02.lc 16:10-16:34  Char
 testdata/language-features/basic-values/fixity02.lc 16:13-16:15  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 16:16-16:19  Char
-testdata/language-features/basic-values/fixity02.lc 16:16-16:22  V0->Char
+testdata/language-features/basic-values/fixity02.lc 16:16-16:22  a_->Char
 testdata/language-features/basic-values/fixity02.lc 16:16-16:34  Char
 testdata/language-features/basic-values/fixity02.lc 16:20-16:22  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 16:23-16:27  String
-testdata/language-features/basic-values/fixity02.lc 16:23-16:30  V0->String
+testdata/language-features/basic-values/fixity02.lc 16:23-16:30  a_->String
 testdata/language-features/basic-values/fixity02.lc 16:23-16:34  String
 testdata/language-features/basic-values/fixity02.lc 16:28-16:30  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 16:31-16:34  Float
 testdata/language-features/basic-values/fixity02.lc 16:38-16:42  Type
 testdata/language-features/basic-values/fixity02.lc 17:1-17:7  String
 testdata/language-features/basic-values/fixity02.lc 17:10-17:12  ()
-testdata/language-features/basic-values/fixity02.lc 17:10-17:15  V0->()
+testdata/language-features/basic-values/fixity02.lc 17:10-17:15  a_->()
 testdata/language-features/basic-values/fixity02.lc 17:10-17:19  ()
-testdata/language-features/basic-values/fixity02.lc 17:10-17:22  V0->V1
+testdata/language-features/basic-values/fixity02.lc 17:10-17:22  a_->b_
 testdata/language-features/basic-values/fixity02.lc 17:10-17:34  String
 testdata/language-features/basic-values/fixity02.lc 17:13-17:15  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 17:16-17:19  Char
 testdata/language-features/basic-values/fixity02.lc 17:20-17:22  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 17:23-17:27  String
-testdata/language-features/basic-values/fixity02.lc 17:23-17:30  V0->String
+testdata/language-features/basic-values/fixity02.lc 17:23-17:30  a_->String
 testdata/language-features/basic-values/fixity02.lc 17:23-17:34  String
 testdata/language-features/basic-values/fixity02.lc 17:28-17:30  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 17:31-17:34  Float
 testdata/language-features/basic-values/fixity02.lc 17:38-17:44  Type
 testdata/language-features/basic-values/fixity02.lc 18:1-18:7  ()
 testdata/language-features/basic-values/fixity02.lc 18:10-18:12  ()
-testdata/language-features/basic-values/fixity02.lc 18:10-18:15  V0->()
+testdata/language-features/basic-values/fixity02.lc 18:10-18:15  a_->()
 testdata/language-features/basic-values/fixity02.lc 18:10-18:34  ()
 testdata/language-features/basic-values/fixity02.lc 18:13-18:15  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 18:16-18:19  Char
-testdata/language-features/basic-values/fixity02.lc 18:16-18:22  V0->Char
+testdata/language-features/basic-values/fixity02.lc 18:16-18:22  a_->Char
 testdata/language-features/basic-values/fixity02.lc 18:16-18:34  Char
 testdata/language-features/basic-values/fixity02.lc 18:20-18:22  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 18:23-18:27  String
-testdata/language-features/basic-values/fixity02.lc 18:23-18:30  V0->String
+testdata/language-features/basic-values/fixity02.lc 18:23-18:30  a_->String
 testdata/language-features/basic-values/fixity02.lc 18:23-18:34  String
 testdata/language-features/basic-values/fixity02.lc 18:28-18:30  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 18:31-18:34  Float
 testdata/language-features/basic-values/fixity02.lc 18:38-18:40  Type
 testdata/language-features/basic-values/fixity02.lc 20:1-20:10  Float
 testdata/language-features/basic-values/fixity02.lc 20:13-20:15  ()
-testdata/language-features/basic-values/fixity02.lc 20:13-20:22  V0->V1
+testdata/language-features/basic-values/fixity02.lc 20:13-20:22  a_->b_
 testdata/language-features/basic-values/fixity02.lc 20:13-20:49  Float
 testdata/language-features/basic-values/fixity02.lc 20:16-20:22  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 20:23-20:26  Char
-testdata/language-features/basic-values/fixity02.lc 20:23-20:33  V0->V1
+testdata/language-features/basic-values/fixity02.lc 20:23-20:33  a_->b_
 testdata/language-features/basic-values/fixity02.lc 20:23-20:49  Float
 testdata/language-features/basic-values/fixity02.lc 20:27-20:33  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 20:34-20:38  String
-testdata/language-features/basic-values/fixity02.lc 20:34-20:45  V0->V1
+testdata/language-features/basic-values/fixity02.lc 20:34-20:45  a_->b_
 testdata/language-features/basic-values/fixity02.lc 20:34-20:49  Float
 testdata/language-features/basic-values/fixity02.lc 20:39-20:45  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 20:46-20:49  Float
 testdata/language-features/basic-values/fixity02.lc 20:53-20:58  Type
 testdata/language-features/basic-values/fixity02.lc 21:1-21:10  Float
 testdata/language-features/basic-values/fixity02.lc 21:13-21:15  ()
-testdata/language-features/basic-values/fixity02.lc 21:13-21:22  V0->V1
+testdata/language-features/basic-values/fixity02.lc 21:13-21:22  a_->b_
 testdata/language-features/basic-values/fixity02.lc 21:13-21:49  Float
 testdata/language-features/basic-values/fixity02.lc 21:16-21:22  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 21:23-21:26  Char
-testdata/language-features/basic-values/fixity02.lc 21:23-21:33  V0->Char
+testdata/language-features/basic-values/fixity02.lc 21:23-21:33  a_->Char
 testdata/language-features/basic-values/fixity02.lc 21:23-21:38  Char
-testdata/language-features/basic-values/fixity02.lc 21:23-21:45  V0->V1
+testdata/language-features/basic-values/fixity02.lc 21:23-21:45  a_->b_
 testdata/language-features/basic-values/fixity02.lc 21:23-21:49  Float
 testdata/language-features/basic-values/fixity02.lc 21:27-21:33  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 21:34-21:38  String
@@ -181,28 +181,28 @@ testdata/language-features/basic-values/fixity02.lc 21:46-21:49  Float
 testdata/language-features/basic-values/fixity02.lc 21:53-21:58  Type
 testdata/language-features/basic-values/fixity02.lc 22:1-22:10  Float
 testdata/language-features/basic-values/fixity02.lc 22:13-22:15  ()
-testdata/language-features/basic-values/fixity02.lc 22:13-22:22  V0->()
+testdata/language-features/basic-values/fixity02.lc 22:13-22:22  a_->()
 testdata/language-features/basic-values/fixity02.lc 22:13-22:26  ()
-testdata/language-features/basic-values/fixity02.lc 22:13-22:33  V0->V1
+testdata/language-features/basic-values/fixity02.lc 22:13-22:33  a_->b_
 testdata/language-features/basic-values/fixity02.lc 22:13-22:49  Float
 testdata/language-features/basic-values/fixity02.lc 22:16-22:22  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 22:23-22:26  Char
 testdata/language-features/basic-values/fixity02.lc 22:27-22:33  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 22:34-22:38  String
-testdata/language-features/basic-values/fixity02.lc 22:34-22:45  V0->V1
+testdata/language-features/basic-values/fixity02.lc 22:34-22:45  a_->b_
 testdata/language-features/basic-values/fixity02.lc 22:34-22:49  Float
 testdata/language-features/basic-values/fixity02.lc 22:39-22:45  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 22:46-22:49  Float
 testdata/language-features/basic-values/fixity02.lc 22:53-22:58  Type
 testdata/language-features/basic-values/fixity02.lc 23:1-23:10  Float
 testdata/language-features/basic-values/fixity02.lc 23:13-23:15  ()
-testdata/language-features/basic-values/fixity02.lc 23:13-23:22  V0->()
+testdata/language-features/basic-values/fixity02.lc 23:13-23:22  a_->()
 testdata/language-features/basic-values/fixity02.lc 23:13-23:38  ()
-testdata/language-features/basic-values/fixity02.lc 23:13-23:45  V0->V1
+testdata/language-features/basic-values/fixity02.lc 23:13-23:45  a_->b_
 testdata/language-features/basic-values/fixity02.lc 23:13-23:49  Float
 testdata/language-features/basic-values/fixity02.lc 23:16-23:22  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 23:23-23:26  Char
-testdata/language-features/basic-values/fixity02.lc 23:23-23:33  V0->Char
+testdata/language-features/basic-values/fixity02.lc 23:23-23:33  a_->Char
 testdata/language-features/basic-values/fixity02.lc 23:23-23:38  Char
 testdata/language-features/basic-values/fixity02.lc 23:27-23:33  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 23:34-23:38  String
@@ -211,60 +211,60 @@ testdata/language-features/basic-values/fixity02.lc 23:46-23:49  Float
 testdata/language-features/basic-values/fixity02.lc 23:53-23:58  Type
 testdata/language-features/basic-values/fixity02.lc 24:1-24:10  String
 testdata/language-features/basic-values/fixity02.lc 24:13-24:15  ()
-testdata/language-features/basic-values/fixity02.lc 24:13-24:22  V0->V1
+testdata/language-features/basic-values/fixity02.lc 24:13-24:22  a_->b_
 testdata/language-features/basic-values/fixity02.lc 24:13-24:49  String
 testdata/language-features/basic-values/fixity02.lc 24:16-24:22  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 24:23-24:26  Char
-testdata/language-features/basic-values/fixity02.lc 24:23-24:33  V0->V1
+testdata/language-features/basic-values/fixity02.lc 24:23-24:33  a_->b_
 testdata/language-features/basic-values/fixity02.lc 24:23-24:49  String
 testdata/language-features/basic-values/fixity02.lc 24:27-24:33  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 24:34-24:38  String
-testdata/language-features/basic-values/fixity02.lc 24:34-24:45  V0->String
+testdata/language-features/basic-values/fixity02.lc 24:34-24:45  a_->String
 testdata/language-features/basic-values/fixity02.lc 24:34-24:49  String
 testdata/language-features/basic-values/fixity02.lc 24:39-24:45  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 24:46-24:49  Float
 testdata/language-features/basic-values/fixity02.lc 24:53-24:59  Type
 testdata/language-features/basic-values/fixity02.lc 25:1-25:10  Char
 testdata/language-features/basic-values/fixity02.lc 25:13-25:15  ()
-testdata/language-features/basic-values/fixity02.lc 25:13-25:22  V0->V1
+testdata/language-features/basic-values/fixity02.lc 25:13-25:22  a_->b_
 testdata/language-features/basic-values/fixity02.lc 25:13-25:49  Char
 testdata/language-features/basic-values/fixity02.lc 25:16-25:22  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 25:23-25:26  Char
-testdata/language-features/basic-values/fixity02.lc 25:23-25:33  V0->Char
+testdata/language-features/basic-values/fixity02.lc 25:23-25:33  a_->Char
 testdata/language-features/basic-values/fixity02.lc 25:23-25:49  Char
 testdata/language-features/basic-values/fixity02.lc 25:27-25:33  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 25:34-25:38  String
-testdata/language-features/basic-values/fixity02.lc 25:34-25:45  V0->String
+testdata/language-features/basic-values/fixity02.lc 25:34-25:45  a_->String
 testdata/language-features/basic-values/fixity02.lc 25:34-25:49  String
 testdata/language-features/basic-values/fixity02.lc 25:39-25:45  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 25:46-25:49  Float
 testdata/language-features/basic-values/fixity02.lc 25:53-25:57  Type
 testdata/language-features/basic-values/fixity02.lc 26:1-26:10  String
 testdata/language-features/basic-values/fixity02.lc 26:13-26:15  ()
-testdata/language-features/basic-values/fixity02.lc 26:13-26:22  V0->()
+testdata/language-features/basic-values/fixity02.lc 26:13-26:22  a_->()
 testdata/language-features/basic-values/fixity02.lc 26:13-26:26  ()
-testdata/language-features/basic-values/fixity02.lc 26:13-26:33  V0->V1
+testdata/language-features/basic-values/fixity02.lc 26:13-26:33  a_->b_
 testdata/language-features/basic-values/fixity02.lc 26:13-26:49  String
 testdata/language-features/basic-values/fixity02.lc 26:16-26:22  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 26:23-26:26  Char
 testdata/language-features/basic-values/fixity02.lc 26:27-26:33  {a} -> {b} -> a -> b->b
 testdata/language-features/basic-values/fixity02.lc 26:34-26:38  String
-testdata/language-features/basic-values/fixity02.lc 26:34-26:45  V0->String
+testdata/language-features/basic-values/fixity02.lc 26:34-26:45  a_->String
 testdata/language-features/basic-values/fixity02.lc 26:34-26:49  String
 testdata/language-features/basic-values/fixity02.lc 26:39-26:45  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 26:46-26:49  Float
 testdata/language-features/basic-values/fixity02.lc 26:53-26:59  Type
 testdata/language-features/basic-values/fixity02.lc 27:1-27:10  ()
 testdata/language-features/basic-values/fixity02.lc 27:13-27:15  ()
-testdata/language-features/basic-values/fixity02.lc 27:13-27:22  V0->()
+testdata/language-features/basic-values/fixity02.lc 27:13-27:22  a_->()
 testdata/language-features/basic-values/fixity02.lc 27:13-27:49  ()
 testdata/language-features/basic-values/fixity02.lc 27:16-27:22  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 27:23-27:26  Char
-testdata/language-features/basic-values/fixity02.lc 27:23-27:33  V0->Char
+testdata/language-features/basic-values/fixity02.lc 27:23-27:33  a_->Char
 testdata/language-features/basic-values/fixity02.lc 27:23-27:49  Char
 testdata/language-features/basic-values/fixity02.lc 27:27-27:33  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 27:34-27:38  String
-testdata/language-features/basic-values/fixity02.lc 27:34-27:45  V0->String
+testdata/language-features/basic-values/fixity02.lc 27:34-27:45  a_->String
 testdata/language-features/basic-values/fixity02.lc 27:34-27:49  String
 testdata/language-features/basic-values/fixity02.lc 27:39-27:45  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/fixity02.lc 27:46-27:49  Float
diff --git a/testdata/language-features/basic-values/infix01.out b/testdata/language-features/basic-values/infix01.out
index 55e8165b..46bcea65 100644
--- a/testdata/language-features/basic-values/infix01.out
+++ b/testdata/language-features/basic-values/infix01.out
@@ -6,8 +6,8 @@ value :: {a} -> {b} -> a -> b->()
 testdata/language-features/basic-values/infix01.lc 1:1-1:4  {a} -> {b} -> a -> b->()
 testdata/language-features/basic-values/infix01.lc 1:11-1:13  ()
 testdata/language-features/basic-values/infix01.lc 3:1-3:6  {a} -> {b} -> a -> b->()
-testdata/language-features/basic-values/infix01.lc 3:13-3:14  V5
-testdata/language-features/basic-values/infix01.lc 3:13-3:20  V0->()
+testdata/language-features/basic-values/infix01.lc 3:13-3:14  f_
+testdata/language-features/basic-values/infix01.lc 3:13-3:20  a_->()
 testdata/language-features/basic-values/infix01.lc 3:13-3:22  ()
 testdata/language-features/basic-values/infix01.lc 3:15-3:20  {a} -> {b} -> a -> b->()
-testdata/language-features/basic-values/infix01.lc 3:21-3:22  V2
+testdata/language-features/basic-values/infix01.lc 3:21-3:22  c_
diff --git a/testdata/language-features/basic-values/infix02.out b/testdata/language-features/basic-values/infix02.out
index 4b8acbd9..ced1c18a 100644
--- a/testdata/language-features/basic-values/infix02.out
+++ b/testdata/language-features/basic-values/infix02.out
@@ -6,8 +6,8 @@ value :: {a} -> {b} -> {c} -> a -> b -> c->()
 testdata/language-features/basic-values/infix02.lc 1:1-1:4  {a} -> {b} -> {c} -> a -> b -> c->()
 testdata/language-features/basic-values/infix02.lc 1:13-1:15  ()
 testdata/language-features/basic-values/infix02.lc 3:1-3:6  {a} -> {b} -> {c} -> a -> b -> c->()
-testdata/language-features/basic-values/infix02.lc 3:13-3:14  V6
-testdata/language-features/basic-values/infix02.lc 3:13-3:20  V1 -> V1->()
-testdata/language-features/basic-values/infix02.lc 3:13-3:22  V0->()
+testdata/language-features/basic-values/infix02.lc 3:13-3:14  g_
+testdata/language-features/basic-values/infix02.lc 3:13-3:20  b_ -> b_->()
+testdata/language-features/basic-values/infix02.lc 3:13-3:22  a_->()
 testdata/language-features/basic-values/infix02.lc 3:15-3:20  {a} -> {b} -> {c} -> a -> b -> c->()
-testdata/language-features/basic-values/infix02.lc 3:21-3:22  V3
+testdata/language-features/basic-values/infix02.lc 3:21-3:22  d_
diff --git a/testdata/language-features/basic-values/infix03.out b/testdata/language-features/basic-values/infix03.out
index e30cedb5..da5c00d2 100644
--- a/testdata/language-features/basic-values/infix03.out
+++ b/testdata/language-features/basic-values/infix03.out
@@ -20,14 +20,14 @@ testdata/language-features/basic-values/infix03.lc 2:13-2:15  Type
 testdata/language-features/basic-values/infix03.lc 2:16-2:18  Type
 testdata/language-features/basic-values/infix03.lc 2:19-2:21  Type
 testdata/language-features/basic-values/infix03.lc 4:1-4:3  () -> ()->D
-testdata/language-features/basic-values/infix03.lc 4:10-4:11  V3
+testdata/language-features/basic-values/infix03.lc 4:10-4:11  d_
 testdata/language-features/basic-values/infix03.lc 4:10-4:16  ()->D
 testdata/language-features/basic-values/infix03.lc 4:10-4:18  D
 testdata/language-features/basic-values/infix03.lc 4:12-4:16  () -> ()->D
-testdata/language-features/basic-values/infix03.lc 4:17-4:18  V1
+testdata/language-features/basic-values/infix03.lc 4:17-4:18  b_
 testdata/language-features/basic-values/infix03.lc 6:1-6:3  () -> () -> ()->D
-testdata/language-features/basic-values/infix03.lc 6:10-6:11  V3
+testdata/language-features/basic-values/infix03.lc 6:10-6:11  d_
 testdata/language-features/basic-values/infix03.lc 6:10-6:16  () -> ()->D
 testdata/language-features/basic-values/infix03.lc 6:10-6:18  ()->D
 testdata/language-features/basic-values/infix03.lc 6:12-6:16  () -> () -> ()->D
-testdata/language-features/basic-values/infix03.lc 6:17-6:18  V1
+testdata/language-features/basic-values/infix03.lc 6:17-6:18  b_
diff --git a/testdata/language-features/basic-values/lambda03.out b/testdata/language-features/basic-values/lambda03.out
index dcca4352..deb16da9 100644
--- a/testdata/language-features/basic-values/lambda03.out
+++ b/testdata/language-features/basic-values/lambda03.out
@@ -4,6 +4,6 @@ fun1 :: {a} -> {b} -> {c} -> a -> b -> c->b
 fun2 :: {a} -> {b} -> {c} -> {d} -> a -> b -> c -> d->a
 ------------ tooltips
 testdata/language-features/basic-values/lambda03.lc 1:1-1:5  {a} -> {b} -> {c} -> a -> b -> c->b
-testdata/language-features/basic-values/lambda03.lc 1:22-1:23  V3
+testdata/language-features/basic-values/lambda03.lc 1:22-1:23  d_
 testdata/language-features/basic-values/lambda03.lc 2:1-2:5  {a} -> {b} -> {c} -> {d} -> a -> b -> c -> d->a
-testdata/language-features/basic-values/lambda03.lc 2:25-2:26  V7
+testdata/language-features/basic-values/lambda03.lc 2:25-2:26  h_
diff --git a/testdata/language-features/basic-values/let01.out b/testdata/language-features/basic-values/let01.out
index dcee8381..da61b7a6 100644
--- a/testdata/language-features/basic-values/let01.out
+++ b/testdata/language-features/basic-values/let01.out
@@ -7,19 +7,19 @@ value4 :: {a} -> {_ : 'Num a}->a
 value5 :: {a} -> {_ : 'Num a}->a
 ------------ tooltips
 testdata/language-features/basic-values/let01.lc 1:1-1:7  {a} -> {_ : Num a}->a
-testdata/language-features/basic-values/let01.lc 1:18-1:19  V1
-testdata/language-features/basic-values/let01.lc 1:23-1:24  V1
+testdata/language-features/basic-values/let01.lc 1:18-1:19  b_
+testdata/language-features/basic-values/let01.lc 1:23-1:24  b_
 testdata/language-features/basic-values/let01.lc 3:1-3:7  {a} -> {_ : Num a}->a
-testdata/language-features/basic-values/let01.lc 4:11-4:12  V1
-testdata/language-features/basic-values/let01.lc 5:6-5:7  V1
+testdata/language-features/basic-values/let01.lc 4:11-4:12  b_
+testdata/language-features/basic-values/let01.lc 5:6-5:7  b_
 testdata/language-features/basic-values/let01.lc 7:1-7:7  {a} -> {_ : Num a}->a
-testdata/language-features/basic-values/let01.lc 8:11-8:12  V1
+testdata/language-features/basic-values/let01.lc 8:11-8:12  b_
 testdata/language-features/basic-values/let01.lc 9:11-9:14  Char
-testdata/language-features/basic-values/let01.lc 10:6-10:7  V1
+testdata/language-features/basic-values/let01.lc 10:6-10:7  b_
 testdata/language-features/basic-values/let01.lc 12:1-12:7  {a} -> {_ : Num a}->a
-testdata/language-features/basic-values/let01.lc 12:18-12:19  V1
-testdata/language-features/basic-values/let01.lc 13:13-13:14  V1
+testdata/language-features/basic-values/let01.lc 12:18-12:19  b_
+testdata/language-features/basic-values/let01.lc 13:13-13:14  b_
 testdata/language-features/basic-values/let01.lc 15:1-15:7  {a} -> {_ : Num a}->a
-testdata/language-features/basic-values/let01.lc 15:18-15:19  V1
-testdata/language-features/basic-values/let01.lc 16:18-16:19  V1
-testdata/language-features/basic-values/let01.lc 17:13-17:14  V1
+testdata/language-features/basic-values/let01.lc 15:18-15:19  b_
+testdata/language-features/basic-values/let01.lc 16:18-16:19  b_
+testdata/language-features/basic-values/let01.lc 17:13-17:14  b_
diff --git a/testdata/language-features/basic-values/let02.out b/testdata/language-features/basic-values/let02.out
index cbbba1b1..164dd687 100644
--- a/testdata/language-features/basic-values/let02.out
+++ b/testdata/language-features/basic-values/let02.out
@@ -7,7 +7,7 @@ testdata/language-features/basic-values/let02.lc 2:11-2:13  ()
 testdata/language-features/basic-values/let02.lc 3:19-3:22  Char
 testdata/language-features/basic-values/let02.lc 3:26-3:28  ()
 testdata/language-features/basic-values/let02.lc 5:17-5:19  ()
-testdata/language-features/basic-values/let02.lc 6:17-6:18  V1
+testdata/language-features/basic-values/let02.lc 6:17-6:18  b_
 testdata/language-features/basic-values/let02.lc 7:17-7:24  String
 testdata/language-features/basic-values/let02.lc 8:12-8:15  Char
 testdata/language-features/basic-values/let02.lc 9:6-9:8  ()
diff --git a/testdata/language-features/basic-values/literal01.out b/testdata/language-features/basic-values/literal01.out
index 464eb78f..65202fb6 100644
--- a/testdata/language-features/basic-values/literal01.out
+++ b/testdata/language-features/basic-values/literal01.out
@@ -10,11 +10,11 @@ stringValue1 :: 'String
 stringValue2 :: 'String
 ------------ tooltips
 testdata/language-features/basic-values/literal01.lc 1:1-1:10  {a} -> {_ : Num a}->a
-testdata/language-features/basic-values/literal01.lc 1:13-1:14  V1
+testdata/language-features/basic-values/literal01.lc 1:13-1:14  b_
 testdata/language-features/basic-values/literal01.lc 2:1-2:10  {a} -> {_ : Num a}->a
-testdata/language-features/basic-values/literal01.lc 2:13-2:14  V1
+testdata/language-features/basic-values/literal01.lc 2:13-2:14  b_
 testdata/language-features/basic-values/literal01.lc 3:1-3:10  {a} -> {_ : Num a}->a
-testdata/language-features/basic-values/literal01.lc 3:13-3:18  V1
+testdata/language-features/basic-values/literal01.lc 3:13-3:18  b_
 testdata/language-features/basic-values/literal01.lc 5:1-5:12  Float
 testdata/language-features/basic-values/literal01.lc 5:15-5:18  Float
 testdata/language-features/basic-values/literal01.lc 6:1-6:12  Float
diff --git a/testdata/language-features/basic-values/operator05.out b/testdata/language-features/basic-values/operator05.out
index f5d25949..30bd0d85 100644
--- a/testdata/language-features/basic-values/operator05.out
+++ b/testdata/language-features/basic-values/operator05.out
@@ -5,7 +5,7 @@ value1 :: ()
 testdata/language-features/basic-values/operator05.lc 1:1-1:7  ()
 testdata/language-features/basic-values/operator05.lc 1:24-1:26  ()
 testdata/language-features/basic-values/operator05.lc 2:13-2:15  ()
-testdata/language-features/basic-values/operator05.lc 2:13-2:19  V0->()
+testdata/language-features/basic-values/operator05.lc 2:13-2:19  a_->()
 testdata/language-features/basic-values/operator05.lc 2:13-2:22  ()
 testdata/language-features/basic-values/operator05.lc 2:16-2:19  {a} -> {b} -> a -> b->()
 testdata/language-features/basic-values/operator05.lc 2:20-2:22  ()
diff --git a/testdata/language-features/basic-values/operator06.out b/testdata/language-features/basic-values/operator06.out
index 863d2185..3aaac182 100644
--- a/testdata/language-features/basic-values/operator06.out
+++ b/testdata/language-features/basic-values/operator06.out
@@ -4,7 +4,7 @@ value1 :: ()
 ------------ tooltips
 testdata/language-features/basic-values/operator06.lc 1:1-1:7  ()
 testdata/language-features/basic-values/operator06.lc 1:10-1:12  ()
-testdata/language-features/basic-values/operator06.lc 1:10-1:16  V0->()
+testdata/language-features/basic-values/operator06.lc 1:10-1:16  a_->()
 testdata/language-features/basic-values/operator06.lc 1:10-1:19  ()
 testdata/language-features/basic-values/operator06.lc 1:13-1:16  {a} -> {b} -> a -> b->()
 testdata/language-features/basic-values/operator06.lc 1:17-1:19  ()
diff --git a/testdata/language-features/basic-values/shadowing01.out b/testdata/language-features/basic-values/shadowing01.out
index d210aa29..9208919f 100644
--- a/testdata/language-features/basic-values/shadowing01.out
+++ b/testdata/language-features/basic-values/shadowing01.out
@@ -5,7 +5,7 @@ value :: 'Char
 testdata/language-features/basic-values/shadowing01.lc 1:1-1:6  Char
 testdata/language-features/basic-values/shadowing01.lc 2:11-2:14  Char
 testdata/language-features/basic-values/shadowing01.lc 3:11-3:18  String
-testdata/language-features/basic-values/shadowing01.lc 5:17-5:18  V1
+testdata/language-features/basic-values/shadowing01.lc 5:17-5:18  b_
 testdata/language-features/basic-values/shadowing01.lc 6:17-6:21  Float
 testdata/language-features/basic-values/shadowing01.lc 7:25-7:27  ()
 testdata/language-features/basic-values/shadowing01.lc 8:25-8:28  Char
diff --git a/testdata/language-features/basic-values/shadowing02.out b/testdata/language-features/basic-values/shadowing02.out
index afc25b2a..22412fea 100644
--- a/testdata/language-features/basic-values/shadowing02.out
+++ b/testdata/language-features/basic-values/shadowing02.out
@@ -5,14 +5,14 @@ world :: 'String
 value2 :: 'Char
 ------------ tooltips
 testdata/language-features/basic-values/shadowing02.lc 1:1-1:2  {a} -> {_ : Num a}->a
-testdata/language-features/basic-values/shadowing02.lc 1:5-1:6  V1
+testdata/language-features/basic-values/shadowing02.lc 1:5-1:6  b_
 testdata/language-features/basic-values/shadowing02.lc 2:1-2:6  String
 testdata/language-features/basic-values/shadowing02.lc 2:9-2:16  String
 testdata/language-features/basic-values/shadowing02.lc 3:1-3:7  Char
 testdata/language-features/basic-values/shadowing02.lc 4:11-4:14  Char
 testdata/language-features/basic-values/shadowing02.lc 5:11-5:18  String
-testdata/language-features/basic-values/shadowing02.lc 6:11-6:14  V1
-testdata/language-features/basic-values/shadowing02.lc 8:17-8:18  V1
+testdata/language-features/basic-values/shadowing02.lc 6:11-6:14  b_
+testdata/language-features/basic-values/shadowing02.lc 8:17-8:18  b_
 testdata/language-features/basic-values/shadowing02.lc 9:17-9:21  Float
 testdata/language-features/basic-values/shadowing02.lc 10:25-10:27  ()
 testdata/language-features/basic-values/shadowing02.lc 11:25-11:28  Char
diff --git a/testdata/language-features/basic-values/tuple02.out b/testdata/language-features/basic-values/tuple02.out
index 8e1d6bab..01174cb2 100644
--- a/testdata/language-features/basic-values/tuple02.out
+++ b/testdata/language-features/basic-values/tuple02.out
@@ -5,8 +5,8 @@ tuple2 :: ((), ())
 tuple3 :: (('String, 'Char), ())
 ------------ tooltips
 testdata/language-features/basic-values/tuple02.lc 1:1-1:7  {a} -> {_ : Num a}->(a, Float, Char, String, ())
-testdata/language-features/basic-values/tuple02.lc 1:10-1:33  (V1, Float, Char, String, ())
-testdata/language-features/basic-values/tuple02.lc 1:11-1:12  V1
+testdata/language-features/basic-values/tuple02.lc 1:10-1:33  (b_, Float, Char, String, ())
+testdata/language-features/basic-values/tuple02.lc 1:11-1:12  b_
 testdata/language-features/basic-values/tuple02.lc 1:13-1:16  Float
 testdata/language-features/basic-values/tuple02.lc 1:13-1:32  (Float, Char, String, ())
 testdata/language-features/basic-values/tuple02.lc 1:17-1:20  Char
diff --git a/testdata/language-features/basic-values/typesig03.out b/testdata/language-features/basic-values/typesig03.out
index c5ab5ad8..17b588bb 100644
--- a/testdata/language-features/basic-values/typesig03.out
+++ b/testdata/language-features/basic-values/typesig03.out
@@ -3,21 +3,21 @@ main is not found
 fun1 :: {a} -> {b} -> {c} -> a -> b -> c->()
 fun2 :: {a} -> {b} -> {c} -> a -> b -> c->()
 ------------ tooltips
-testdata/language-features/basic-values/typesig03.lc 1:9-1:10  V5
+testdata/language-features/basic-values/typesig03.lc 1:9-1:10  f_
 testdata/language-features/basic-values/typesig03.lc 1:9-1:26  Type
-testdata/language-features/basic-values/typesig03.lc 1:14-1:15  V4
+testdata/language-features/basic-values/typesig03.lc 1:14-1:15  e_
 testdata/language-features/basic-values/typesig03.lc 1:14-1:26  Type
-testdata/language-features/basic-values/typesig03.lc 1:19-1:20  V3
+testdata/language-features/basic-values/typesig03.lc 1:19-1:20  d_
 testdata/language-features/basic-values/typesig03.lc 1:19-1:26  Type
 testdata/language-features/basic-values/typesig03.lc 1:24-1:26  Type
 testdata/language-features/basic-values/typesig03.lc 2:1-2:5  {a} -> {b} -> {c} -> a -> b -> c->()
-testdata/language-features/basic-values/typesig03.lc 2:14-2:16  () | V2 -> V2 -> V2->() | V2 -> V2->() | V2->()
-testdata/language-features/basic-values/typesig03.lc 4:7-4:8  V5
+testdata/language-features/basic-values/typesig03.lc 2:14-2:16  () | c_ -> c_ -> c_->() | c_ -> c_->() | c_->()
+testdata/language-features/basic-values/typesig03.lc 4:7-4:8  f_
 testdata/language-features/basic-values/typesig03.lc 4:7-4:18  Type
-testdata/language-features/basic-values/typesig03.lc 4:10-4:11  V4
+testdata/language-features/basic-values/typesig03.lc 4:10-4:11  e_
 testdata/language-features/basic-values/typesig03.lc 4:10-4:18  Type
-testdata/language-features/basic-values/typesig03.lc 4:13-4:14  V3
+testdata/language-features/basic-values/typesig03.lc 4:13-4:14  d_
 testdata/language-features/basic-values/typesig03.lc 4:13-4:18  Type
 testdata/language-features/basic-values/typesig03.lc 4:16-4:18  Type
 testdata/language-features/basic-values/typesig03.lc 5:1-5:5  {a} -> {b} -> {c} -> a -> b -> c->()
-testdata/language-features/basic-values/typesig03.lc 5:14-5:16  () | V2 -> V2 -> V2->() | V2 -> V2->() | V2->()
+testdata/language-features/basic-values/typesig03.lc 5:14-5:16  () | c_ -> c_ -> c_->() | c_ -> c_->() | c_->()
diff --git a/testdata/language-features/basic-values/typesig04.out b/testdata/language-features/basic-values/typesig04.out
index dafe7490..773e6f5a 100644
--- a/testdata/language-features/basic-values/typesig04.out
+++ b/testdata/language-features/basic-values/typesig04.out
@@ -3,19 +3,19 @@ main is not found
 fun1 :: {a} -> {b} -> {c} -> a -> b->c -> ()
 fun2 :: {a} -> {b} -> {c} -> a -> b->c -> ()
 ------------ tooltips
-testdata/language-features/basic-values/typesig04.lc 1:9-1:10  V5
+testdata/language-features/basic-values/typesig04.lc 1:9-1:10  f_
 testdata/language-features/basic-values/typesig04.lc 1:9-1:28  Type
 testdata/language-features/basic-values/typesig04.lc 1:14-1:28  Type
-testdata/language-features/basic-values/typesig04.lc 1:15-1:16  V4
-testdata/language-features/basic-values/typesig04.lc 1:20-1:21  Type | V3
+testdata/language-features/basic-values/typesig04.lc 1:15-1:16  e_
+testdata/language-features/basic-values/typesig04.lc 1:20-1:21  Type | d_
 testdata/language-features/basic-values/typesig04.lc 1:26-1:28  Type
 testdata/language-features/basic-values/typesig04.lc 2:1-2:5  {a} -> {b} -> {c} -> a -> b->c -> ()
-testdata/language-features/basic-values/typesig04.lc 2:12-2:14  () | V2 -> V2->V2 -> () | V2->V2 -> ()
-testdata/language-features/basic-values/typesig04.lc 4:7-4:8  V5
+testdata/language-features/basic-values/typesig04.lc 2:12-2:14  () | c_ -> c_->c_ -> () | c_->c_ -> ()
+testdata/language-features/basic-values/typesig04.lc 4:7-4:8  f_
 testdata/language-features/basic-values/typesig04.lc 4:7-4:20  Type
 testdata/language-features/basic-values/typesig04.lc 4:10-4:20  Type
-testdata/language-features/basic-values/typesig04.lc 4:11-4:12  V4
-testdata/language-features/basic-values/typesig04.lc 4:14-4:15  Type | V3
+testdata/language-features/basic-values/typesig04.lc 4:11-4:12  e_
+testdata/language-features/basic-values/typesig04.lc 4:14-4:15  Type | d_
 testdata/language-features/basic-values/typesig04.lc 4:18-4:20  Type
 testdata/language-features/basic-values/typesig04.lc 5:1-5:5  {a} -> {b} -> {c} -> a -> b->c -> ()
-testdata/language-features/basic-values/typesig04.lc 5:12-5:14  () | V2 -> V2->V2 -> () | V2->V2 -> ()
+testdata/language-features/basic-values/typesig04.lc 5:12-5:14  () | c_ -> c_->c_ -> () | c_->c_ -> ()
diff --git a/testdata/language-features/basic-values/typesig05.out b/testdata/language-features/basic-values/typesig05.out
index 07a8d216..3bd47db6 100644
--- a/testdata/language-features/basic-values/typesig05.out
+++ b/testdata/language-features/basic-values/typesig05.out
@@ -8,19 +8,19 @@ value3 :: 'Char
 value4 :: 'String
 ------------ tooltips
 testdata/language-features/basic-values/typesig05.lc 1:1-1:5  {a} -> {b} -> a -> b->a
-testdata/language-features/basic-values/typesig05.lc 1:12-1:13  V3
+testdata/language-features/basic-values/typesig05.lc 1:12-1:13  d_
 testdata/language-features/basic-values/typesig05.lc 2:1-2:5  {a} -> {b} -> a -> b->b
-testdata/language-features/basic-values/typesig05.lc 2:12-2:13  V1
+testdata/language-features/basic-values/typesig05.lc 2:12-2:13  b_
 testdata/language-features/basic-values/typesig05.lc 4:1-4:7  Char
 testdata/language-features/basic-values/typesig05.lc 4:10-4:14  {a} -> {b} -> a -> b->a
-testdata/language-features/basic-values/typesig05.lc 4:10-4:18  V0->Char
+testdata/language-features/basic-values/typesig05.lc 4:10-4:18  a_->Char
 testdata/language-features/basic-values/typesig05.lc 4:10-4:22  Char
 testdata/language-features/basic-values/typesig05.lc 4:15-4:18  Char
 testdata/language-features/basic-values/typesig05.lc 4:19-4:22  String
 testdata/language-features/basic-values/typesig05.lc 4:26-4:30  Type
 testdata/language-features/basic-values/typesig05.lc 5:1-5:7  String
 testdata/language-features/basic-values/typesig05.lc 5:10-5:14  {a} -> {b} -> a -> b->b
-testdata/language-features/basic-values/typesig05.lc 5:10-5:18  V0->V1
+testdata/language-features/basic-values/typesig05.lc 5:10-5:18  a_->b_
 testdata/language-features/basic-values/typesig05.lc 5:10-5:22  String
 testdata/language-features/basic-values/typesig05.lc 5:15-5:18  Char
 testdata/language-features/basic-values/typesig05.lc 5:19-5:22  String
@@ -28,14 +28,14 @@ testdata/language-features/basic-values/typesig05.lc 5:26-5:32  Type
 testdata/language-features/basic-values/typesig05.lc 7:11-7:15  Type
 testdata/language-features/basic-values/typesig05.lc 8:1-8:7  Char
 testdata/language-features/basic-values/typesig05.lc 8:10-8:14  {a} -> {b} -> a -> b->a
-testdata/language-features/basic-values/typesig05.lc 8:10-8:18  V0->Char
+testdata/language-features/basic-values/typesig05.lc 8:10-8:18  a_->Char
 testdata/language-features/basic-values/typesig05.lc 8:10-8:22  Char
 testdata/language-features/basic-values/typesig05.lc 8:15-8:18  Char
 testdata/language-features/basic-values/typesig05.lc 8:19-8:22  String
 testdata/language-features/basic-values/typesig05.lc 10:11-10:17  Type
 testdata/language-features/basic-values/typesig05.lc 11:1-11:7  String
 testdata/language-features/basic-values/typesig05.lc 11:10-11:14  {a} -> {b} -> a -> b->b
-testdata/language-features/basic-values/typesig05.lc 11:10-11:18  V0->V1
+testdata/language-features/basic-values/typesig05.lc 11:10-11:18  a_->b_
 testdata/language-features/basic-values/typesig05.lc 11:10-11:22  String
 testdata/language-features/basic-values/typesig05.lc 11:15-11:18  Char
 testdata/language-features/basic-values/typesig05.lc 11:19-11:22  String
diff --git a/testdata/language-features/basic-values/typesig06.out b/testdata/language-features/basic-values/typesig06.out
index f9454255..74e9a83b 100644
--- a/testdata/language-features/basic-values/typesig06.out
+++ b/testdata/language-features/basic-values/typesig06.out
@@ -6,19 +6,19 @@ value1 :: 'String
 value2 :: 'String
 ------------ tooltips
 testdata/language-features/basic-values/typesig06.lc 1:1-1:5  {a} -> {b} -> a -> b->a
-testdata/language-features/basic-values/typesig06.lc 1:12-1:13  V3
+testdata/language-features/basic-values/typesig06.lc 1:12-1:13  d_
 testdata/language-features/basic-values/typesig06.lc 2:3-2:5  {a} -> {b} -> a -> b->a
-testdata/language-features/basic-values/typesig06.lc 2:10-2:11  V3
+testdata/language-features/basic-values/typesig06.lc 2:10-2:11  d_
 testdata/language-features/basic-values/typesig06.lc 4:1-4:7  String
 testdata/language-features/basic-values/typesig06.lc 4:10-4:14  String
-testdata/language-features/basic-values/typesig06.lc 4:10-4:17  V0->String
+testdata/language-features/basic-values/typesig06.lc 4:10-4:17  a_->String
 testdata/language-features/basic-values/typesig06.lc 4:10-4:21  String
 testdata/language-features/basic-values/typesig06.lc 4:15-4:17  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/typesig06.lc 4:18-4:21  Float
 testdata/language-features/basic-values/typesig06.lc 4:25-4:31  Type
 testdata/language-features/basic-values/typesig06.lc 5:1-5:7  String
 testdata/language-features/basic-values/typesig06.lc 5:10-5:14  String
-testdata/language-features/basic-values/typesig06.lc 5:10-5:21  V0->String
+testdata/language-features/basic-values/typesig06.lc 5:10-5:21  a_->String
 testdata/language-features/basic-values/typesig06.lc 5:10-5:25  String
 testdata/language-features/basic-values/typesig06.lc 5:15-5:21  {a} -> {b} -> a -> b->a
 testdata/language-features/basic-values/typesig06.lc 5:22-5:25  Float
diff --git a/testdata/language-features/basic-values/typesig07.out b/testdata/language-features/basic-values/typesig07.out
index a88c824d..705cd6f0 100644
--- a/testdata/language-features/basic-values/typesig07.out
+++ b/testdata/language-features/basic-values/typesig07.out
@@ -9,11 +9,11 @@ value6 :: () -> ()->()
 ------------ tooltips
 testdata/language-features/basic-values/typesig07.lc 1:27-1:30  Type
 testdata/language-features/basic-values/typesig07.lc 3:1-3:7  Int
-testdata/language-features/basic-values/typesig07.lc 3:10-3:11  V1
+testdata/language-features/basic-values/typesig07.lc 3:10-3:11  b_
 testdata/language-features/basic-values/typesig07.lc 4:1-4:7  Int
-testdata/language-features/basic-values/typesig07.lc 4:10-4:11  V1
+testdata/language-features/basic-values/typesig07.lc 4:10-4:11  b_
 testdata/language-features/basic-values/typesig07.lc 5:1-5:7  Int
-testdata/language-features/basic-values/typesig07.lc 5:10-5:11  V1
+testdata/language-features/basic-values/typesig07.lc 5:10-5:11  b_
 testdata/language-features/basic-values/typesig07.lc 8:12-8:14  Type
 testdata/language-features/basic-values/typesig07.lc 8:18-8:20  Type
 testdata/language-features/basic-values/typesig07.lc 8:18-8:26  Type
diff --git a/testdata/language-features/basic-values/typesyn02.out b/testdata/language-features/basic-values/typesyn02.out
index 657f3fef..e1d50e47 100644
--- a/testdata/language-features/basic-values/typesyn02.out
+++ b/testdata/language-features/basic-values/typesyn02.out
@@ -5,10 +5,10 @@ fun :: {a} -> a -> ()->()
 ------------ tooltips
 testdata/language-features/basic-values/typesyn02.lc 1:6-1:12  Type
 testdata/language-features/basic-values/typesyn02.lc 1:15-1:17  Type
-testdata/language-features/basic-values/typesyn02.lc 3:8-3:9  V1
+testdata/language-features/basic-values/typesyn02.lc 3:8-3:9  b_
 testdata/language-features/basic-values/typesyn02.lc 3:8-3:29  Type
 testdata/language-features/basic-values/typesyn02.lc 3:13-3:19  Type
 testdata/language-features/basic-values/typesyn02.lc 3:13-3:29  Type
 testdata/language-features/basic-values/typesyn02.lc 3:23-3:29  Type
 testdata/language-features/basic-values/typesyn02.lc 4:1-4:4  {a} -> a -> ()->()
-testdata/language-features/basic-values/typesyn02.lc 4:12-4:14  () | ()->() | V0 -> ()->()
+testdata/language-features/basic-values/typesyn02.lc 4:12-4:14  () | ()->() | a_ -> ()->()
diff --git a/testdata/language-features/basic-values/where05.out b/testdata/language-features/basic-values/where05.out
index b730c962..72af1e72 100644
--- a/testdata/language-features/basic-values/where05.out
+++ b/testdata/language-features/basic-values/where05.out
@@ -7,28 +7,28 @@ value4 :: {a} -> {_ : 'Eq a} -> {_ : 'Num a}->()
 ------------ tooltips
 testdata/language-features/basic-values/where05.lc 1:1-1:7  {a} -> {_ : Eq a} -> {_ : Num a}->()
 testdata/language-features/basic-values/where05.lc 1:10-3:10  ()
-testdata/language-features/basic-values/where05.lc 1:15-1:16  V1
+testdata/language-features/basic-values/where05.lc 1:15-1:16  b_
 testdata/language-features/basic-values/where05.lc 2:8-2:9  ()
 testdata/language-features/basic-values/where05.lc 2:8-3:10  Bool->()
 testdata/language-features/basic-values/where05.lc 2:20-2:22  ()
 testdata/language-features/basic-values/where05.lc 3:8-3:10  ()
 testdata/language-features/basic-values/where05.lc 5:1-5:7  {a} -> {_ : Eq a} -> {_ : Num a}->()
 testdata/language-features/basic-values/where05.lc 5:10-8:10  ()
-testdata/language-features/basic-values/where05.lc 5:15-5:16  V1
+testdata/language-features/basic-values/where05.lc 5:15-5:16  b_
 testdata/language-features/basic-values/where05.lc 6:8-6:9  ()
 testdata/language-features/basic-values/where05.lc 6:8-8:10  Bool->()
 testdata/language-features/basic-values/where05.lc 7:14-7:16  ()
 testdata/language-features/basic-values/where05.lc 8:8-8:10  ()
 testdata/language-features/basic-values/where05.lc 10:1-10:7  {a} -> {_ : Eq a} -> {_ : Num a}->()
 testdata/language-features/basic-values/where05.lc 10:10-14:10  ()
-testdata/language-features/basic-values/where05.lc 10:15-10:16  V1
+testdata/language-features/basic-values/where05.lc 10:15-10:16  b_
 testdata/language-features/basic-values/where05.lc 11:8-11:9  ()
 testdata/language-features/basic-values/where05.lc 11:8-14:10  Bool->()
 testdata/language-features/basic-values/where05.lc 13:8-13:10  ()
 testdata/language-features/basic-values/where05.lc 14:8-14:10  ()
 testdata/language-features/basic-values/where05.lc 16:1-16:7  {a} -> {_ : Eq a} -> {_ : Num a}->()
 testdata/language-features/basic-values/where05.lc 16:10-18:10  ()
-testdata/language-features/basic-values/where05.lc 16:15-16:16  V1
+testdata/language-features/basic-values/where05.lc 16:15-16:16  b_
 testdata/language-features/basic-values/where05.lc 17:8-17:9  ()
 testdata/language-features/basic-values/where05.lc 17:8-18:10  Bool->()
 testdata/language-features/basic-values/where05.lc 18:8-18:10  ()
diff --git a/testdata/language-features/guard/guard11.out b/testdata/language-features/guard/guard11.out
index ccfb6079..8c5ea30b 100644
--- a/testdata/language-features/guard/guard11.out
+++ b/testdata/language-features/guard/guard11.out
@@ -3,7 +3,7 @@ main is not found
 fun :: 'Bool->'String
 ------------ tooltips
 testdata/language-features/guard/guard11.lc 1:1-1:4  Bool->String
-testdata/language-features/guard/guard11.lc 2:5-2:6  V1
+testdata/language-features/guard/guard11.lc 2:5-2:6  b_
 testdata/language-features/guard/guard11.lc 2:5-3:24  String
 testdata/language-features/guard/guard11.lc 2:9-2:15  String
 testdata/language-features/guard/guard11.lc 2:9-3:24  Bool->String
diff --git a/testdata/language-features/guard/guard13.out b/testdata/language-features/guard/guard13.out
index 57230369..dc689b1e 100644
--- a/testdata/language-features/guard/guard13.out
+++ b/testdata/language-features/guard/guard13.out
@@ -3,7 +3,7 @@ main is not found
 fun :: 'Bool->()
 ------------ tooltips
 testdata/language-features/guard/guard13.lc 1:1-1:4  Bool->()
-testdata/language-features/guard/guard13.lc 1:7-1:8  V1
+testdata/language-features/guard/guard13.lc 1:7-1:8  b_
 testdata/language-features/guard/guard13.lc 1:7-1:24  ()
 testdata/language-features/guard/guard13.lc 1:9-1:11  ()
 testdata/language-features/guard/guard13.lc 1:9-1:24  Bool->()
diff --git a/testdata/language-features/guard/guard16.out b/testdata/language-features/guard/guard16.out
index a8f7f183..e1e6fd18 100644
--- a/testdata/language-features/guard/guard16.out
+++ b/testdata/language-features/guard/guard16.out
@@ -4,7 +4,7 @@ value :: {a} -> {_ : 'Eq a} -> {_ : 'Num a}->()
 ------------ tooltips
 testdata/language-features/guard/guard16.lc 1:1-1:6  {a} -> {_ : Eq a} -> {_ : Num a}->()
 testdata/language-features/guard/guard16.lc 1:9-3:10  ()
-testdata/language-features/guard/guard16.lc 1:14-1:15  V1
+testdata/language-features/guard/guard16.lc 1:14-1:15  b_
 testdata/language-features/guard/guard16.lc 2:7-2:11  Bool
 testdata/language-features/guard/guard16.lc 2:7-3:10  ()
 testdata/language-features/guard/guard16.lc 2:15-2:17  ()
diff --git a/testdata/language-features/module/import09.out b/testdata/language-features/module/import09.out
index 3c192c4d..77ac024a 100644
--- a/testdata/language-features/module/import09.out
+++ b/testdata/language-features/module/import09.out
@@ -2,10 +2,10 @@ main is not found
 ------------ trace
 fun :: {a} -> a -> ()->()
 ------------ tooltips
-testdata/language-features/module/import09.lc 3:8-3:9  V1
+testdata/language-features/module/import09.lc 3:8-3:9  b_
 testdata/language-features/module/import09.lc 3:8-3:29  Type
 testdata/language-features/module/import09.lc 3:13-3:19  Type
 testdata/language-features/module/import09.lc 3:13-3:29  Type
 testdata/language-features/module/import09.lc 3:23-3:29  Type
 testdata/language-features/module/import09.lc 4:1-4:4  {a} -> a -> ()->()
-testdata/language-features/module/import09.lc 4:12-4:14  () | ()->() | V0 -> ()->()
+testdata/language-features/module/import09.lc 4:12-4:14  () | ()->() | a_ -> ()->()
diff --git a/testdata/language-features/pattern/uncovered.out b/testdata/language-features/pattern/uncovered.out
index aa3d6536..5434c818 100644
--- a/testdata/language-features/pattern/uncovered.out
+++ b/testdata/language-features/pattern/uncovered.out
@@ -3,12 +3,12 @@ main is not found
 f :: {a} -> {_ : 'Num a} -> 'Bool -> 'Bool -> 'Bool->a
 ------------ tooltips
 testdata/language-features/pattern/uncovered.lc 4:1-4:2  {a} -> {_ : Num a} -> Bool -> Bool -> Bool->a
-testdata/language-features/pattern/uncovered.lc 4:18-4:19  V1
-testdata/language-features/pattern/uncovered.lc 4:18-5:19  Bool->V3 | V2
-testdata/language-features/pattern/uncovered.lc 4:18-6:19  Bool->V3
-testdata/language-features/pattern/uncovered.lc 5:18-5:19  V1 | V2
-testdata/language-features/pattern/uncovered.lc 5:18-6:19  Bool->V3 | V1
-testdata/language-features/pattern/uncovered.lc 6:18-6:19  V1
+testdata/language-features/pattern/uncovered.lc 4:18-4:19  b_
+testdata/language-features/pattern/uncovered.lc 4:18-5:19  Bool->d_ | c_
+testdata/language-features/pattern/uncovered.lc 4:18-6:19  Bool->d_
+testdata/language-features/pattern/uncovered.lc 5:18-5:19  b_ | c_
+testdata/language-features/pattern/uncovered.lc 5:18-6:19  Bool->d_ | b_
+testdata/language-features/pattern/uncovered.lc 6:18-6:19  b_
 ------------ warnings
 Uncovered pattern(s) at testdata/language-features/pattern/uncovered.lc:4:1:
 f _ True False = 0
diff --git a/testdata/language-features/recursion/simplerec01.out b/testdata/language-features/recursion/simplerec01.out
index 3359c95c..fd6f16c4 100644
--- a/testdata/language-features/recursion/simplerec01.out
+++ b/testdata/language-features/recursion/simplerec01.out
@@ -4,6 +4,6 @@ fun :: {a} -> {_ : 'Num a} -> {_ : 'Eq a} -> {_ : 'Num a} -> a->'Char
 ------------ tooltips
 testdata/language-features/recursion/simplerec01.lc 1:1-1:4  {a} -> {_ : Num a} -> {_ : Eq a} -> {_ : Num a} -> a->Char
 testdata/language-features/recursion/simplerec01.lc 1:9-1:12  Char
-testdata/language-features/recursion/simplerec01.lc 1:9-2:14  Bool->Char | V0->V1
-testdata/language-features/recursion/simplerec01.lc 2:9-2:12  V4
-testdata/language-features/recursion/simplerec01.lc 2:13-2:14  V1
+testdata/language-features/recursion/simplerec01.lc 1:9-2:14  Bool->Char | a_->b_
+testdata/language-features/recursion/simplerec01.lc 2:9-2:12  e_
+testdata/language-features/recursion/simplerec01.lc 2:13-2:14  b_
diff --git a/testdata/language-features/recursion/simplerec02.out b/testdata/language-features/recursion/simplerec02.out
index 7f15bef6..0d2d20b6 100644
--- a/testdata/language-features/recursion/simplerec02.out
+++ b/testdata/language-features/recursion/simplerec02.out
@@ -4,7 +4,7 @@ value :: ()
 ------------ tooltips
 testdata/language-features/recursion/simplerec02.lc 1:1-1:6  ()
 testdata/language-features/recursion/simplerec02.lc 1:21-1:24  Char
-testdata/language-features/recursion/simplerec02.lc 1:21-2:26  Bool->Char | V0->V1
-testdata/language-features/recursion/simplerec02.lc 2:21-2:24  V4
-testdata/language-features/recursion/simplerec02.lc 2:25-2:26  V1
+testdata/language-features/recursion/simplerec02.lc 1:21-2:26  Bool->Char | a_->b_
+testdata/language-features/recursion/simplerec02.lc 2:21-2:24  e_
+testdata/language-features/recursion/simplerec02.lc 2:25-2:26  b_
 testdata/language-features/recursion/simplerec02.lc 3:12-3:14  ()
diff --git a/testdata/language-features/recursion/simplerec03.out b/testdata/language-features/recursion/simplerec03.out
index a4b0473e..9a1a3bb2 100644
--- a/testdata/language-features/recursion/simplerec03.out
+++ b/testdata/language-features/recursion/simplerec03.out
@@ -5,6 +5,6 @@ value :: ()
 testdata/language-features/recursion/simplerec03.lc 1:1-1:6  ()
 testdata/language-features/recursion/simplerec03.lc 1:9-1:11  ()
 testdata/language-features/recursion/simplerec03.lc 3:13-3:16  Char
-testdata/language-features/recursion/simplerec03.lc 3:13-4:18  Bool->Char | V0->V1
-testdata/language-features/recursion/simplerec03.lc 4:13-4:16  V4
-testdata/language-features/recursion/simplerec03.lc 4:17-4:18  V1
+testdata/language-features/recursion/simplerec03.lc 3:13-4:18  Bool->Char | a_->b_
+testdata/language-features/recursion/simplerec03.lc 4:13-4:16  e_
+testdata/language-features/recursion/simplerec03.lc 4:17-4:18  b_
diff --git a/testdata/language-features/section/section01.out b/testdata/language-features/section/section01.out
index 26e5dd1b..e33ef53b 100644
--- a/testdata/language-features/section/section01.out
+++ b/testdata/language-features/section/section01.out
@@ -7,10 +7,10 @@ value2 :: {a} -> {b} -> a -> b->()
 testdata/language-features/section/section01.lc 1:3-1:6  {a} -> {b} -> a -> b->()
 testdata/language-features/section/section01.lc 1:11-1:13  ()
 testdata/language-features/section/section01.lc 3:1-3:7  {a} -> {b} -> a -> b->()
-testdata/language-features/section/section01.lc 3:13-3:14  V5
-testdata/language-features/section/section01.lc 3:13-3:18  V0->()
+testdata/language-features/section/section01.lc 3:13-3:14  f_
+testdata/language-features/section/section01.lc 3:13-3:18  a_->()
 testdata/language-features/section/section01.lc 3:15-3:18  {a} -> {b} -> a -> b->()
 testdata/language-features/section/section01.lc 5:1-5:7  {a} -> {b} -> a -> b->()
 testdata/language-features/section/section01.lc 5:13-5:16  {a} -> {b} -> a -> b->()
 testdata/language-features/section/section01.lc 5:13-5:18  ()
-testdata/language-features/section/section01.lc 5:17-5:18  V4
+testdata/language-features/section/section01.lc 5:17-5:18  e_
diff --git a/testdata/let.out b/testdata/let.out
index 51ab71d9..e3da6694 100644
--- a/testdata/let.out
+++ b/testdata/let.out
@@ -4,6 +4,6 @@ f :: {a} -> a->a
 ------------ tooltips
 testdata/let.lc 2:1-2:2  {a} -> a->a
 testdata/let.lc 2:15-2:17  {a} -> a->a
-testdata/let.lc 2:15-2:19  V1
-testdata/let.lc 2:18-2:19  V2
-testdata/let.lc 2:23-2:24  V2
+testdata/let.lc 2:15-2:19  b_
+testdata/let.lc 2:18-2:19  c_
+testdata/let.lc 2:23-2:24  c_
diff --git a/testdata/letIndent.out b/testdata/letIndent.out
index abaf52ca..9dbbd933 100644
--- a/testdata/letIndent.out
+++ b/testdata/letIndent.out
@@ -3,6 +3,6 @@ main is not found
 fun :: {a} -> a->a
 ------------ tooltips
 testdata/letIndent.lc 2:1-2:4  {a} -> a->a
-testdata/letIndent.lc 3:10-3:11  V1
-testdata/letIndent.lc 4:10-4:11  V1
-testdata/letIndent.lc 5:7-5:8  V3
+testdata/letIndent.lc 3:10-3:11  b_
+testdata/letIndent.lc 4:10-4:11  b_
+testdata/letIndent.lc 5:7-5:8  d_
diff --git a/testdata/performance/Material.out b/testdata/performance/Material.out
index a66716b4..5e629ad7 100644
--- a/testdata/performance/Material.out
+++ b/testdata/performance/Material.out
@@ -159,7 +159,7 @@ defaultCommonAttrs :: 'CommonAttrs
 ------------ tooltips
 testdata/performance/Material.lc 7:18-7:23  Type
 testdata/performance/Material.lc 8:1-8:14  Float
-testdata/performance/Material.lc 8:17-8:18  V1
+testdata/performance/Material.lc 8:17-8:18  b_
 testdata/performance/Material.lc 10:6-10:12  Type
 testdata/performance/Material.lc 10:6-11:13  Type
 testdata/performance/Material.lc 10:6-15:39  Type
@@ -168,25 +168,25 @@ testdata/performance/Material.lc 12:7-12:20  Entity -> VecS Float 4
 testdata/performance/Material.lc 12:28-12:31  Nat -> Type->Type
 testdata/performance/Material.lc 12:28-12:33  Type->Type
 testdata/performance/Material.lc 12:28-12:39  Type
-testdata/performance/Material.lc 12:32-12:33  V1
+testdata/performance/Material.lc 12:32-12:33  b_
 testdata/performance/Material.lc 12:34-12:39  Type
 testdata/performance/Material.lc 13:7-13:21  Entity -> VecS Float 4
 testdata/performance/Material.lc 13:28-13:31  Nat -> Type->Type
 testdata/performance/Material.lc 13:28-13:33  Type->Type
 testdata/performance/Material.lc 13:28-13:39  Type
-testdata/performance/Material.lc 13:32-13:33  V1
+testdata/performance/Material.lc 13:32-13:33  b_
 testdata/performance/Material.lc 13:34-13:39  Type
 testdata/performance/Material.lc 14:7-14:16  Entity -> VecS Float 3
 testdata/performance/Material.lc 14:28-14:31  Nat -> Type->Type
 testdata/performance/Material.lc 14:28-14:33  Type->Type
 testdata/performance/Material.lc 14:28-14:39  Type
-testdata/performance/Material.lc 14:32-14:33  V1
+testdata/performance/Material.lc 14:32-14:33  b_
 testdata/performance/Material.lc 14:34-14:39  Type
 testdata/performance/Material.lc 15:7-15:18  Entity -> VecS Float 4
 testdata/performance/Material.lc 15:28-15:31  Nat -> Type->Type
 testdata/performance/Material.lc 15:28-15:33  Type->Type
 testdata/performance/Material.lc 15:28-15:39  Type
-testdata/performance/Material.lc 15:32-15:33  V1
+testdata/performance/Material.lc 15:32-15:33  b_
 testdata/performance/Material.lc 15:34-15:39  Type
 testdata/performance/Material.lc 18:6-18:14  Type
 testdata/performance/Material.lc 18:6-24:15  Type
@@ -221,7 +221,7 @@ testdata/performance/Material.lc 33:7-33:13  Deform | Type | Vec 3 Float -> Wave
 testdata/performance/Material.lc 33:15-33:18  Nat -> Type->Type
 testdata/performance/Material.lc 33:15-33:20  Type->Type
 testdata/performance/Material.lc 33:15-33:26  Type
-testdata/performance/Material.lc 33:19-33:20  V1
+testdata/performance/Material.lc 33:19-33:20  b_
 testdata/performance/Material.lc 33:21-33:26  Type
 testdata/performance/Material.lc 33:28-33:32  Type
 testdata/performance/Material.lc 34:7-34:15  Deform | Float -> Float->Deform | Type
@@ -298,12 +298,12 @@ testdata/performance/Material.lc 97:7-97:16  TCGen | Type | Vec 3 Float -> Vec 3
 testdata/performance/Material.lc 97:18-97:21  Nat -> Type->Type
 testdata/performance/Material.lc 97:18-97:23  Type->Type
 testdata/performance/Material.lc 97:18-97:29  Type
-testdata/performance/Material.lc 97:22-97:23  V1
+testdata/performance/Material.lc 97:22-97:23  b_
 testdata/performance/Material.lc 97:24-97:29  Type
 testdata/performance/Material.lc 97:32-97:35  Nat -> Type->Type
 testdata/performance/Material.lc 97:32-97:37  Type->Type
 testdata/performance/Material.lc 97:32-97:43  Type
-testdata/performance/Material.lc 97:36-97:37  V1
+testdata/performance/Material.lc 97:36-97:37  b_
 testdata/performance/Material.lc 97:38-97:43  Type
 testdata/performance/Material.lc 98:7-98:19  TCGen
 testdata/performance/Material.lc 101:6-101:11  Type
@@ -464,7 +464,7 @@ testdata/performance/Material.lc 183:22-196:6  CommonAttrs
 testdata/performance/Material.lc 184:27-184:29  ()
 testdata/performance/Material.lc 185:27-185:29  ()
 testdata/performance/Material.lc 186:27-186:32  Bool
-testdata/performance/Material.lc 187:27-187:28  V1
+testdata/performance/Material.lc 187:27-187:28  b_
 testdata/performance/Material.lc 188:27-188:32  Bool
 testdata/performance/Material.lc 189:27-189:32  Bool
 testdata/performance/Material.lc 190:27-190:40  CullType
diff --git a/testdata/performance/SampleMaterial.out b/testdata/performance/SampleMaterial.out
index e1f1c1fd..21d41c59 100644
--- a/testdata/performance/SampleMaterial.out
+++ b/testdata/performance/SampleMaterial.out
@@ -22,7 +22,7 @@ testdata/performance/SampleMaterial.lc 5:7-45:10  ((CommonAttrs)) | CommonAttrs
 testdata/performance/SampleMaterial.lc 6:24-6:26  ()
 testdata/performance/SampleMaterial.lc 7:24-7:26  ()
 testdata/performance/SampleMaterial.lc 8:22-8:27  Bool
-testdata/performance/SampleMaterial.lc 9:20-9:21  V1
+testdata/performance/SampleMaterial.lc 9:20-9:21  b_
 testdata/performance/SampleMaterial.lc 10:30-10:35  Bool
 testdata/performance/SampleMaterial.lc 11:23-11:28  Bool
 testdata/performance/SampleMaterial.lc 12:20-12:33  CullType
@@ -102,7 +102,7 @@ testdata/performance/SampleMaterial.lc 48:7-88:10  ((CommonAttrs)) | CommonAttrs
 testdata/performance/SampleMaterial.lc 49:24-49:26  ()
 testdata/performance/SampleMaterial.lc 50:24-50:26  ()
 testdata/performance/SampleMaterial.lc 51:22-51:27  Bool
-testdata/performance/SampleMaterial.lc 52:20-52:21  V1
+testdata/performance/SampleMaterial.lc 52:20-52:21  b_
 testdata/performance/SampleMaterial.lc 53:30-53:35  Bool
 testdata/performance/SampleMaterial.lc 54:23-54:28  Bool
 testdata/performance/SampleMaterial.lc 55:20-55:33  CullType
@@ -182,7 +182,7 @@ testdata/performance/SampleMaterial.lc 91:7-131:10  ((CommonAttrs)) | CommonAttr
 testdata/performance/SampleMaterial.lc 92:24-92:26  ()
 testdata/performance/SampleMaterial.lc 93:24-93:26  ()
 testdata/performance/SampleMaterial.lc 94:22-94:27  Bool
-testdata/performance/SampleMaterial.lc 95:20-95:21  V1
+testdata/performance/SampleMaterial.lc 95:20-95:21  b_
 testdata/performance/SampleMaterial.lc 96:30-96:35  Bool
 testdata/performance/SampleMaterial.lc 97:23-97:28  Bool
 testdata/performance/SampleMaterial.lc 98:20-98:33  CullType
@@ -262,7 +262,7 @@ testdata/performance/SampleMaterial.lc 134:7-174:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 135:24-135:26  ()
 testdata/performance/SampleMaterial.lc 136:24-136:26  ()
 testdata/performance/SampleMaterial.lc 137:22-137:27  Bool
-testdata/performance/SampleMaterial.lc 138:20-138:21  V1
+testdata/performance/SampleMaterial.lc 138:20-138:21  b_
 testdata/performance/SampleMaterial.lc 139:30-139:35  Bool
 testdata/performance/SampleMaterial.lc 140:23-140:28  Bool
 testdata/performance/SampleMaterial.lc 141:20-141:33  CullType
@@ -342,7 +342,7 @@ testdata/performance/SampleMaterial.lc 177:7-231:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 178:24-178:26  ()
 testdata/performance/SampleMaterial.lc 179:24-179:26  ()
 testdata/performance/SampleMaterial.lc 180:22-180:27  Bool
-testdata/performance/SampleMaterial.lc 181:20-181:21  V1
+testdata/performance/SampleMaterial.lc 181:20-181:21  b_
 testdata/performance/SampleMaterial.lc 182:30-182:35  Bool
 testdata/performance/SampleMaterial.lc 183:23-183:28  Bool
 testdata/performance/SampleMaterial.lc 184:20-184:33  CullType
@@ -472,7 +472,7 @@ testdata/performance/SampleMaterial.lc 234:7-274:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 235:24-235:26  ()
 testdata/performance/SampleMaterial.lc 236:24-236:26  ()
 testdata/performance/SampleMaterial.lc 237:22-237:27  Bool
-testdata/performance/SampleMaterial.lc 238:20-238:21  V1
+testdata/performance/SampleMaterial.lc 238:20-238:21  b_
 testdata/performance/SampleMaterial.lc 239:30-239:35  Bool
 testdata/performance/SampleMaterial.lc 240:23-240:28  Bool
 testdata/performance/SampleMaterial.lc 241:20-241:33  CullType
@@ -552,7 +552,7 @@ testdata/performance/SampleMaterial.lc 277:7-317:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 278:24-278:26  ()
 testdata/performance/SampleMaterial.lc 279:24-279:26  ()
 testdata/performance/SampleMaterial.lc 280:22-280:27  Bool
-testdata/performance/SampleMaterial.lc 281:20-281:21  V1
+testdata/performance/SampleMaterial.lc 281:20-281:21  b_
 testdata/performance/SampleMaterial.lc 282:30-282:35  Bool
 testdata/performance/SampleMaterial.lc 283:23-283:28  Bool
 testdata/performance/SampleMaterial.lc 284:20-284:33  CullType
@@ -632,7 +632,7 @@ testdata/performance/SampleMaterial.lc 320:7-360:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 321:24-321:26  ()
 testdata/performance/SampleMaterial.lc 322:24-322:26  ()
 testdata/performance/SampleMaterial.lc 323:22-323:27  Bool
-testdata/performance/SampleMaterial.lc 324:20-324:21  V1
+testdata/performance/SampleMaterial.lc 324:20-324:21  b_
 testdata/performance/SampleMaterial.lc 325:30-325:35  Bool
 testdata/performance/SampleMaterial.lc 326:23-326:28  Bool
 testdata/performance/SampleMaterial.lc 327:20-327:33  CullType
@@ -712,7 +712,7 @@ testdata/performance/SampleMaterial.lc 363:7-403:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 364:24-364:26  ()
 testdata/performance/SampleMaterial.lc 365:24-365:26  ()
 testdata/performance/SampleMaterial.lc 366:22-366:27  Bool
-testdata/performance/SampleMaterial.lc 367:20-367:21  V1
+testdata/performance/SampleMaterial.lc 367:20-367:21  b_
 testdata/performance/SampleMaterial.lc 368:30-368:35  Bool
 testdata/performance/SampleMaterial.lc 369:23-369:28  Bool
 testdata/performance/SampleMaterial.lc 370:20-370:33  CullType
@@ -792,7 +792,7 @@ testdata/performance/SampleMaterial.lc 406:7-446:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 407:24-407:26  ()
 testdata/performance/SampleMaterial.lc 408:24-408:26  ()
 testdata/performance/SampleMaterial.lc 409:22-409:27  Bool
-testdata/performance/SampleMaterial.lc 410:20-410:21  V1
+testdata/performance/SampleMaterial.lc 410:20-410:21  b_
 testdata/performance/SampleMaterial.lc 411:30-411:35  Bool
 testdata/performance/SampleMaterial.lc 412:23-412:28  Bool
 testdata/performance/SampleMaterial.lc 413:20-413:33  CullType
@@ -872,7 +872,7 @@ testdata/performance/SampleMaterial.lc 449:7-489:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 450:24-450:26  ()
 testdata/performance/SampleMaterial.lc 451:24-451:26  ()
 testdata/performance/SampleMaterial.lc 452:22-452:27  Bool
-testdata/performance/SampleMaterial.lc 453:20-453:21  V1
+testdata/performance/SampleMaterial.lc 453:20-453:21  b_
 testdata/performance/SampleMaterial.lc 454:30-454:35  Bool
 testdata/performance/SampleMaterial.lc 455:23-455:28  Bool
 testdata/performance/SampleMaterial.lc 456:20-456:33  CullType
@@ -952,7 +952,7 @@ testdata/performance/SampleMaterial.lc 492:7-532:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 493:24-493:26  ()
 testdata/performance/SampleMaterial.lc 494:24-494:26  ()
 testdata/performance/SampleMaterial.lc 495:22-495:27  Bool
-testdata/performance/SampleMaterial.lc 496:20-496:21  V1
+testdata/performance/SampleMaterial.lc 496:20-496:21  b_
 testdata/performance/SampleMaterial.lc 497:30-497:35  Bool
 testdata/performance/SampleMaterial.lc 498:23-498:28  Bool
 testdata/performance/SampleMaterial.lc 499:20-499:33  CullType
@@ -1032,7 +1032,7 @@ testdata/performance/SampleMaterial.lc 535:7-575:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 536:24-536:26  ()
 testdata/performance/SampleMaterial.lc 537:24-537:26  ()
 testdata/performance/SampleMaterial.lc 538:22-538:27  Bool
-testdata/performance/SampleMaterial.lc 539:20-539:21  V1
+testdata/performance/SampleMaterial.lc 539:20-539:21  b_
 testdata/performance/SampleMaterial.lc 540:30-540:35  Bool
 testdata/performance/SampleMaterial.lc 541:23-541:28  Bool
 testdata/performance/SampleMaterial.lc 542:20-542:33  CullType
@@ -1112,7 +1112,7 @@ testdata/performance/SampleMaterial.lc 578:7-618:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 579:24-579:26  ()
 testdata/performance/SampleMaterial.lc 580:24-580:26  ()
 testdata/performance/SampleMaterial.lc 581:22-581:27  Bool
-testdata/performance/SampleMaterial.lc 582:20-582:21  V1
+testdata/performance/SampleMaterial.lc 582:20-582:21  b_
 testdata/performance/SampleMaterial.lc 583:30-583:35  Bool
 testdata/performance/SampleMaterial.lc 584:23-584:28  Bool
 testdata/performance/SampleMaterial.lc 585:20-585:33  CullType
@@ -1192,7 +1192,7 @@ testdata/performance/SampleMaterial.lc 621:7-661:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 622:24-622:26  ()
 testdata/performance/SampleMaterial.lc 623:24-623:26  ()
 testdata/performance/SampleMaterial.lc 624:22-624:27  Bool
-testdata/performance/SampleMaterial.lc 625:20-625:21  V1
+testdata/performance/SampleMaterial.lc 625:20-625:21  b_
 testdata/performance/SampleMaterial.lc 626:30-626:35  Bool
 testdata/performance/SampleMaterial.lc 627:23-627:28  Bool
 testdata/performance/SampleMaterial.lc 628:20-628:33  CullType
@@ -1272,7 +1272,7 @@ testdata/performance/SampleMaterial.lc 664:7-704:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 665:24-665:26  ()
 testdata/performance/SampleMaterial.lc 666:24-666:26  ()
 testdata/performance/SampleMaterial.lc 667:22-667:27  Bool
-testdata/performance/SampleMaterial.lc 668:20-668:21  V1
+testdata/performance/SampleMaterial.lc 668:20-668:21  b_
 testdata/performance/SampleMaterial.lc 669:30-669:35  Bool
 testdata/performance/SampleMaterial.lc 670:23-670:28  Bool
 testdata/performance/SampleMaterial.lc 671:20-671:33  CullType
@@ -1352,7 +1352,7 @@ testdata/performance/SampleMaterial.lc 707:7-747:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 708:24-708:26  ()
 testdata/performance/SampleMaterial.lc 709:24-709:26  ()
 testdata/performance/SampleMaterial.lc 710:22-710:27  Bool
-testdata/performance/SampleMaterial.lc 711:20-711:21  V1
+testdata/performance/SampleMaterial.lc 711:20-711:21  b_
 testdata/performance/SampleMaterial.lc 712:30-712:35  Bool
 testdata/performance/SampleMaterial.lc 713:23-713:28  Bool
 testdata/performance/SampleMaterial.lc 714:20-714:33  CullType
@@ -1432,7 +1432,7 @@ testdata/performance/SampleMaterial.lc 750:7-790:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 751:24-751:26  ()
 testdata/performance/SampleMaterial.lc 752:24-752:26  ()
 testdata/performance/SampleMaterial.lc 753:22-753:27  Bool
-testdata/performance/SampleMaterial.lc 754:20-754:21  V1
+testdata/performance/SampleMaterial.lc 754:20-754:21  b_
 testdata/performance/SampleMaterial.lc 755:30-755:35  Bool
 testdata/performance/SampleMaterial.lc 756:23-756:28  Bool
 testdata/performance/SampleMaterial.lc 757:20-757:33  CullType
@@ -1512,7 +1512,7 @@ testdata/performance/SampleMaterial.lc 793:7-833:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 794:24-794:26  ()
 testdata/performance/SampleMaterial.lc 795:24-795:26  ()
 testdata/performance/SampleMaterial.lc 796:22-796:27  Bool
-testdata/performance/SampleMaterial.lc 797:20-797:21  V1
+testdata/performance/SampleMaterial.lc 797:20-797:21  b_
 testdata/performance/SampleMaterial.lc 798:30-798:35  Bool
 testdata/performance/SampleMaterial.lc 799:23-799:28  Bool
 testdata/performance/SampleMaterial.lc 800:20-800:33  CullType
@@ -1592,7 +1592,7 @@ testdata/performance/SampleMaterial.lc 836:7-890:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 837:24-837:26  ()
 testdata/performance/SampleMaterial.lc 838:24-838:26  ()
 testdata/performance/SampleMaterial.lc 839:22-839:27  Bool
-testdata/performance/SampleMaterial.lc 840:20-840:21  V1
+testdata/performance/SampleMaterial.lc 840:20-840:21  b_
 testdata/performance/SampleMaterial.lc 841:30-841:35  Bool
 testdata/performance/SampleMaterial.lc 842:23-842:28  Bool
 testdata/performance/SampleMaterial.lc 843:20-843:33  CullType
@@ -1722,7 +1722,7 @@ testdata/performance/SampleMaterial.lc 893:7-933:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 894:24-894:26  ()
 testdata/performance/SampleMaterial.lc 895:24-895:26  ()
 testdata/performance/SampleMaterial.lc 896:22-896:27  Bool
-testdata/performance/SampleMaterial.lc 897:20-897:21  V1
+testdata/performance/SampleMaterial.lc 897:20-897:21  b_
 testdata/performance/SampleMaterial.lc 898:30-898:35  Bool
 testdata/performance/SampleMaterial.lc 899:23-899:28  Bool
 testdata/performance/SampleMaterial.lc 900:20-900:33  CullType
@@ -1802,7 +1802,7 @@ testdata/performance/SampleMaterial.lc 936:7-977:10  ((CommonAttrs)) | CommonAtt
 testdata/performance/SampleMaterial.lc 937:24-937:26  ()
 testdata/performance/SampleMaterial.lc 938:24-938:26  ()
 testdata/performance/SampleMaterial.lc 939:22-939:27  Bool
-testdata/performance/SampleMaterial.lc 940:20-940:21  V1
+testdata/performance/SampleMaterial.lc 940:20-940:21  b_
 testdata/performance/SampleMaterial.lc 941:30-941:35  Bool
 testdata/performance/SampleMaterial.lc 942:23-942:28  Bool
 testdata/performance/SampleMaterial.lc 943:20-943:33  CullType
@@ -1882,7 +1882,7 @@ testdata/performance/SampleMaterial.lc 980:7-1020:10  ((CommonAttrs)) | CommonAt
 testdata/performance/SampleMaterial.lc 981:24-981:26  ()
 testdata/performance/SampleMaterial.lc 982:24-982:26  ()
 testdata/performance/SampleMaterial.lc 983:22-983:27  Bool
-testdata/performance/SampleMaterial.lc 984:20-984:21  V1
+testdata/performance/SampleMaterial.lc 984:20-984:21  b_
 testdata/performance/SampleMaterial.lc 985:30-985:35  Bool
 testdata/performance/SampleMaterial.lc 986:23-986:28  Bool
 testdata/performance/SampleMaterial.lc 987:20-987:33  CullType
@@ -1962,7 +1962,7 @@ testdata/performance/SampleMaterial.lc 1023:7-1063:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1024:24-1024:26  ()
 testdata/performance/SampleMaterial.lc 1025:24-1025:26  ()
 testdata/performance/SampleMaterial.lc 1026:22-1026:27  Bool
-testdata/performance/SampleMaterial.lc 1027:20-1027:21  V1
+testdata/performance/SampleMaterial.lc 1027:20-1027:21  b_
 testdata/performance/SampleMaterial.lc 1028:30-1028:35  Bool
 testdata/performance/SampleMaterial.lc 1029:23-1029:28  Bool
 testdata/performance/SampleMaterial.lc 1030:20-1030:33  CullType
@@ -2042,7 +2042,7 @@ testdata/performance/SampleMaterial.lc 1066:7-1106:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1067:24-1067:26  ()
 testdata/performance/SampleMaterial.lc 1068:24-1068:26  ()
 testdata/performance/SampleMaterial.lc 1069:22-1069:27  Bool
-testdata/performance/SampleMaterial.lc 1070:20-1070:21  V1
+testdata/performance/SampleMaterial.lc 1070:20-1070:21  b_
 testdata/performance/SampleMaterial.lc 1071:30-1071:35  Bool
 testdata/performance/SampleMaterial.lc 1072:23-1072:28  Bool
 testdata/performance/SampleMaterial.lc 1073:20-1073:33  CullType
@@ -2122,7 +2122,7 @@ testdata/performance/SampleMaterial.lc 1109:7-1149:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1110:24-1110:26  ()
 testdata/performance/SampleMaterial.lc 1111:24-1111:26  ()
 testdata/performance/SampleMaterial.lc 1112:22-1112:27  Bool
-testdata/performance/SampleMaterial.lc 1113:20-1113:21  V1
+testdata/performance/SampleMaterial.lc 1113:20-1113:21  b_
 testdata/performance/SampleMaterial.lc 1114:30-1114:35  Bool
 testdata/performance/SampleMaterial.lc 1115:23-1115:28  Bool
 testdata/performance/SampleMaterial.lc 1116:20-1116:33  CullType
@@ -2202,7 +2202,7 @@ testdata/performance/SampleMaterial.lc 1152:7-1192:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1153:24-1153:26  ()
 testdata/performance/SampleMaterial.lc 1154:24-1154:26  ()
 testdata/performance/SampleMaterial.lc 1155:22-1155:27  Bool
-testdata/performance/SampleMaterial.lc 1156:20-1156:21  V1
+testdata/performance/SampleMaterial.lc 1156:20-1156:21  b_
 testdata/performance/SampleMaterial.lc 1157:30-1157:35  Bool
 testdata/performance/SampleMaterial.lc 1158:23-1158:28  Bool
 testdata/performance/SampleMaterial.lc 1159:20-1159:33  CullType
@@ -2282,7 +2282,7 @@ testdata/performance/SampleMaterial.lc 1195:7-1235:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1196:24-1196:26  ()
 testdata/performance/SampleMaterial.lc 1197:24-1197:26  ()
 testdata/performance/SampleMaterial.lc 1198:22-1198:27  Bool
-testdata/performance/SampleMaterial.lc 1199:20-1199:21  V1
+testdata/performance/SampleMaterial.lc 1199:20-1199:21  b_
 testdata/performance/SampleMaterial.lc 1200:30-1200:35  Bool
 testdata/performance/SampleMaterial.lc 1201:23-1201:28  Bool
 testdata/performance/SampleMaterial.lc 1202:20-1202:33  CullType
@@ -2362,7 +2362,7 @@ testdata/performance/SampleMaterial.lc 1238:7-1278:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1239:24-1239:26  ()
 testdata/performance/SampleMaterial.lc 1240:24-1240:26  ()
 testdata/performance/SampleMaterial.lc 1241:22-1241:27  Bool
-testdata/performance/SampleMaterial.lc 1242:20-1242:21  V1
+testdata/performance/SampleMaterial.lc 1242:20-1242:21  b_
 testdata/performance/SampleMaterial.lc 1243:30-1243:35  Bool
 testdata/performance/SampleMaterial.lc 1244:23-1244:28  Bool
 testdata/performance/SampleMaterial.lc 1245:20-1245:33  CullType
@@ -2442,7 +2442,7 @@ testdata/performance/SampleMaterial.lc 1281:7-1321:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1282:24-1282:26  ()
 testdata/performance/SampleMaterial.lc 1283:24-1283:26  ()
 testdata/performance/SampleMaterial.lc 1284:22-1284:27  Bool
-testdata/performance/SampleMaterial.lc 1285:20-1285:21  V1
+testdata/performance/SampleMaterial.lc 1285:20-1285:21  b_
 testdata/performance/SampleMaterial.lc 1286:30-1286:35  Bool
 testdata/performance/SampleMaterial.lc 1287:23-1287:28  Bool
 testdata/performance/SampleMaterial.lc 1288:20-1288:33  CullType
@@ -2522,7 +2522,7 @@ testdata/performance/SampleMaterial.lc 1324:7-1364:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1325:24-1325:26  ()
 testdata/performance/SampleMaterial.lc 1326:24-1326:26  ()
 testdata/performance/SampleMaterial.lc 1327:22-1327:27  Bool
-testdata/performance/SampleMaterial.lc 1328:20-1328:21  V1
+testdata/performance/SampleMaterial.lc 1328:20-1328:21  b_
 testdata/performance/SampleMaterial.lc 1329:30-1329:35  Bool
 testdata/performance/SampleMaterial.lc 1330:23-1330:28  Bool
 testdata/performance/SampleMaterial.lc 1331:20-1331:33  CullType
@@ -2602,7 +2602,7 @@ testdata/performance/SampleMaterial.lc 1367:7-1407:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1368:24-1368:26  ()
 testdata/performance/SampleMaterial.lc 1369:24-1369:26  ()
 testdata/performance/SampleMaterial.lc 1370:22-1370:27  Bool
-testdata/performance/SampleMaterial.lc 1371:20-1371:21  V1
+testdata/performance/SampleMaterial.lc 1371:20-1371:21  b_
 testdata/performance/SampleMaterial.lc 1372:30-1372:35  Bool
 testdata/performance/SampleMaterial.lc 1373:23-1373:28  Bool
 testdata/performance/SampleMaterial.lc 1374:20-1374:33  CullType
@@ -2682,7 +2682,7 @@ testdata/performance/SampleMaterial.lc 1410:7-1450:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1411:24-1411:26  ()
 testdata/performance/SampleMaterial.lc 1412:24-1412:26  ()
 testdata/performance/SampleMaterial.lc 1413:22-1413:27  Bool
-testdata/performance/SampleMaterial.lc 1414:20-1414:21  V1
+testdata/performance/SampleMaterial.lc 1414:20-1414:21  b_
 testdata/performance/SampleMaterial.lc 1415:30-1415:35  Bool
 testdata/performance/SampleMaterial.lc 1416:23-1416:28  Bool
 testdata/performance/SampleMaterial.lc 1417:20-1417:33  CullType
@@ -2762,7 +2762,7 @@ testdata/performance/SampleMaterial.lc 1453:7-1493:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1454:24-1454:26  ()
 testdata/performance/SampleMaterial.lc 1455:24-1455:26  ()
 testdata/performance/SampleMaterial.lc 1456:22-1456:27  Bool
-testdata/performance/SampleMaterial.lc 1457:20-1457:21  V1
+testdata/performance/SampleMaterial.lc 1457:20-1457:21  b_
 testdata/performance/SampleMaterial.lc 1458:30-1458:35  Bool
 testdata/performance/SampleMaterial.lc 1459:23-1459:28  Bool
 testdata/performance/SampleMaterial.lc 1460:20-1460:33  CullType
@@ -2842,7 +2842,7 @@ testdata/performance/SampleMaterial.lc 1496:7-1536:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1497:24-1497:26  ()
 testdata/performance/SampleMaterial.lc 1498:24-1498:26  ()
 testdata/performance/SampleMaterial.lc 1499:22-1499:27  Bool
-testdata/performance/SampleMaterial.lc 1500:20-1500:21  V1
+testdata/performance/SampleMaterial.lc 1500:20-1500:21  b_
 testdata/performance/SampleMaterial.lc 1501:30-1501:35  Bool
 testdata/performance/SampleMaterial.lc 1502:23-1502:28  Bool
 testdata/performance/SampleMaterial.lc 1503:20-1503:33  CullType
@@ -2922,7 +2922,7 @@ testdata/performance/SampleMaterial.lc 1539:7-1579:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1540:24-1540:26  ()
 testdata/performance/SampleMaterial.lc 1541:24-1541:26  ()
 testdata/performance/SampleMaterial.lc 1542:22-1542:27  Bool
-testdata/performance/SampleMaterial.lc 1543:20-1543:21  V1
+testdata/performance/SampleMaterial.lc 1543:20-1543:21  b_
 testdata/performance/SampleMaterial.lc 1544:30-1544:35  Bool
 testdata/performance/SampleMaterial.lc 1545:23-1545:28  Bool
 testdata/performance/SampleMaterial.lc 1546:20-1546:33  CullType
@@ -3002,7 +3002,7 @@ testdata/performance/SampleMaterial.lc 1582:7-1622:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1583:24-1583:26  ()
 testdata/performance/SampleMaterial.lc 1584:24-1584:26  ()
 testdata/performance/SampleMaterial.lc 1585:22-1585:27  Bool
-testdata/performance/SampleMaterial.lc 1586:20-1586:21  V1
+testdata/performance/SampleMaterial.lc 1586:20-1586:21  b_
 testdata/performance/SampleMaterial.lc 1587:30-1587:35  Bool
 testdata/performance/SampleMaterial.lc 1588:23-1588:28  Bool
 testdata/performance/SampleMaterial.lc 1589:20-1589:33  CullType
@@ -3082,7 +3082,7 @@ testdata/performance/SampleMaterial.lc 1625:7-1665:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1626:24-1626:26  ()
 testdata/performance/SampleMaterial.lc 1627:24-1627:26  ()
 testdata/performance/SampleMaterial.lc 1628:22-1628:27  Bool
-testdata/performance/SampleMaterial.lc 1629:20-1629:21  V1
+testdata/performance/SampleMaterial.lc 1629:20-1629:21  b_
 testdata/performance/SampleMaterial.lc 1630:30-1630:35  Bool
 testdata/performance/SampleMaterial.lc 1631:23-1631:28  Bool
 testdata/performance/SampleMaterial.lc 1632:20-1632:33  CullType
@@ -3162,7 +3162,7 @@ testdata/performance/SampleMaterial.lc 1668:7-1708:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1669:24-1669:26  ()
 testdata/performance/SampleMaterial.lc 1670:24-1670:26  ()
 testdata/performance/SampleMaterial.lc 1671:22-1671:27  Bool
-testdata/performance/SampleMaterial.lc 1672:20-1672:21  V1
+testdata/performance/SampleMaterial.lc 1672:20-1672:21  b_
 testdata/performance/SampleMaterial.lc 1673:30-1673:35  Bool
 testdata/performance/SampleMaterial.lc 1674:23-1674:28  Bool
 testdata/performance/SampleMaterial.lc 1675:20-1675:33  CullType
@@ -3242,7 +3242,7 @@ testdata/performance/SampleMaterial.lc 1711:7-1751:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1712:24-1712:26  ()
 testdata/performance/SampleMaterial.lc 1713:24-1713:26  ()
 testdata/performance/SampleMaterial.lc 1714:22-1714:27  Bool
-testdata/performance/SampleMaterial.lc 1715:20-1715:21  V1
+testdata/performance/SampleMaterial.lc 1715:20-1715:21  b_
 testdata/performance/SampleMaterial.lc 1716:30-1716:35  Bool
 testdata/performance/SampleMaterial.lc 1717:23-1717:28  Bool
 testdata/performance/SampleMaterial.lc 1718:20-1718:33  CullType
@@ -3322,7 +3322,7 @@ testdata/performance/SampleMaterial.lc 1754:7-1794:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1755:24-1755:26  ()
 testdata/performance/SampleMaterial.lc 1756:24-1756:26  ()
 testdata/performance/SampleMaterial.lc 1757:22-1757:27  Bool
-testdata/performance/SampleMaterial.lc 1758:20-1758:21  V1
+testdata/performance/SampleMaterial.lc 1758:20-1758:21  b_
 testdata/performance/SampleMaterial.lc 1759:30-1759:35  Bool
 testdata/performance/SampleMaterial.lc 1760:23-1760:28  Bool
 testdata/performance/SampleMaterial.lc 1761:20-1761:33  CullType
@@ -3402,7 +3402,7 @@ testdata/performance/SampleMaterial.lc 1797:7-1837:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1798:24-1798:26  ()
 testdata/performance/SampleMaterial.lc 1799:24-1799:26  ()
 testdata/performance/SampleMaterial.lc 1800:22-1800:27  Bool
-testdata/performance/SampleMaterial.lc 1801:20-1801:21  V1
+testdata/performance/SampleMaterial.lc 1801:20-1801:21  b_
 testdata/performance/SampleMaterial.lc 1802:30-1802:35  Bool
 testdata/performance/SampleMaterial.lc 1803:23-1803:28  Bool
 testdata/performance/SampleMaterial.lc 1804:20-1804:33  CullType
@@ -3482,7 +3482,7 @@ testdata/performance/SampleMaterial.lc 1840:7-1880:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1841:24-1841:26  ()
 testdata/performance/SampleMaterial.lc 1842:24-1842:26  ()
 testdata/performance/SampleMaterial.lc 1843:22-1843:27  Bool
-testdata/performance/SampleMaterial.lc 1844:20-1844:21  V1
+testdata/performance/SampleMaterial.lc 1844:20-1844:21  b_
 testdata/performance/SampleMaterial.lc 1845:30-1845:35  Bool
 testdata/performance/SampleMaterial.lc 1846:23-1846:28  Bool
 testdata/performance/SampleMaterial.lc 1847:20-1847:33  CullType
@@ -3562,7 +3562,7 @@ testdata/performance/SampleMaterial.lc 1883:7-1923:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1884:24-1884:26  ()
 testdata/performance/SampleMaterial.lc 1885:24-1885:26  ()
 testdata/performance/SampleMaterial.lc 1886:22-1886:27  Bool
-testdata/performance/SampleMaterial.lc 1887:20-1887:21  V1
+testdata/performance/SampleMaterial.lc 1887:20-1887:21  b_
 testdata/performance/SampleMaterial.lc 1888:30-1888:35  Bool
 testdata/performance/SampleMaterial.lc 1889:23-1889:28  Bool
 testdata/performance/SampleMaterial.lc 1890:20-1890:33  CullType
@@ -3642,7 +3642,7 @@ testdata/performance/SampleMaterial.lc 1926:7-1966:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1927:24-1927:26  ()
 testdata/performance/SampleMaterial.lc 1928:24-1928:26  ()
 testdata/performance/SampleMaterial.lc 1929:22-1929:27  Bool
-testdata/performance/SampleMaterial.lc 1930:20-1930:21  V1
+testdata/performance/SampleMaterial.lc 1930:20-1930:21  b_
 testdata/performance/SampleMaterial.lc 1931:30-1931:35  Bool
 testdata/performance/SampleMaterial.lc 1932:23-1932:28  Bool
 testdata/performance/SampleMaterial.lc 1933:20-1933:33  CullType
@@ -3722,7 +3722,7 @@ testdata/performance/SampleMaterial.lc 1969:7-2009:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 1970:24-1970:26  ()
 testdata/performance/SampleMaterial.lc 1971:24-1971:26  ()
 testdata/performance/SampleMaterial.lc 1972:22-1972:27  Bool
-testdata/performance/SampleMaterial.lc 1973:20-1973:21  V1
+testdata/performance/SampleMaterial.lc 1973:20-1973:21  b_
 testdata/performance/SampleMaterial.lc 1974:30-1974:35  Bool
 testdata/performance/SampleMaterial.lc 1975:23-1975:28  Bool
 testdata/performance/SampleMaterial.lc 1976:20-1976:33  CullType
@@ -3802,7 +3802,7 @@ testdata/performance/SampleMaterial.lc 2012:7-2052:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 2013:24-2013:26  ()
 testdata/performance/SampleMaterial.lc 2014:24-2014:26  ()
 testdata/performance/SampleMaterial.lc 2015:22-2015:27  Bool
-testdata/performance/SampleMaterial.lc 2016:20-2016:21  V1
+testdata/performance/SampleMaterial.lc 2016:20-2016:21  b_
 testdata/performance/SampleMaterial.lc 2017:30-2017:35  Bool
 testdata/performance/SampleMaterial.lc 2018:23-2018:28  Bool
 testdata/performance/SampleMaterial.lc 2019:20-2019:33  CullType
@@ -3882,7 +3882,7 @@ testdata/performance/SampleMaterial.lc 2055:7-2095:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 2056:24-2056:26  ()
 testdata/performance/SampleMaterial.lc 2057:24-2057:26  ()
 testdata/performance/SampleMaterial.lc 2058:22-2058:27  Bool
-testdata/performance/SampleMaterial.lc 2059:20-2059:21  V1
+testdata/performance/SampleMaterial.lc 2059:20-2059:21  b_
 testdata/performance/SampleMaterial.lc 2060:30-2060:35  Bool
 testdata/performance/SampleMaterial.lc 2061:23-2061:28  Bool
 testdata/performance/SampleMaterial.lc 2062:20-2062:33  CullType
@@ -3962,7 +3962,7 @@ testdata/performance/SampleMaterial.lc 2098:7-2138:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 2099:24-2099:26  ()
 testdata/performance/SampleMaterial.lc 2100:24-2100:26  ()
 testdata/performance/SampleMaterial.lc 2101:22-2101:27  Bool
-testdata/performance/SampleMaterial.lc 2102:20-2102:21  V1
+testdata/performance/SampleMaterial.lc 2102:20-2102:21  b_
 testdata/performance/SampleMaterial.lc 2103:30-2103:35  Bool
 testdata/performance/SampleMaterial.lc 2104:23-2104:28  Bool
 testdata/performance/SampleMaterial.lc 2105:20-2105:33  CullType
@@ -4041,7 +4041,7 @@ testdata/performance/SampleMaterial.lc 2141:7-2181:10  ((CommonAttrs)) | CommonA
 testdata/performance/SampleMaterial.lc 2142:24-2142:26  ()
 testdata/performance/SampleMaterial.lc 2143:24-2143:26  ()
 testdata/performance/SampleMaterial.lc 2144:22-2144:27  Bool
-testdata/performance/SampleMaterial.lc 2145:20-2145:21  V1
+testdata/performance/SampleMaterial.lc 2145:20-2145:21  b_
 testdata/performance/SampleMaterial.lc 2146:30-2146:35  Bool
 testdata/performance/SampleMaterial.lc 2147:23-2147:28  Bool
 testdata/performance/SampleMaterial.lc 2148:20-2148:33  CullType
diff --git a/testdata/record01.reject.out b/testdata/record01.reject.out
index 43054afc..78ef20e3 100644
--- a/testdata/record01.reject.out
+++ b/testdata/record01.reject.out
@@ -1,5 +1,5 @@
 type error: can not unify
-'FrameBuffer V1 V0
+'FrameBuffer b_ a_
 with
 'Float
 
@@ -9,7 +9,7 @@ in testdata/record01.reject.lc:26:15:
 
 ------------ trace
 !type error: can not unify
-'FrameBuffer V1 V0
+'FrameBuffer b_ a_
 with
 'Float
 
@@ -22,7 +22,7 @@ testdata/record01.reject.lc 2:16-2:21  (BlendEquation, BlendEquation) -> ((Blend
 testdata/record01.reject.lc 2:16-2:23  ((BlendingFactor, BlendingFactor), (BlendingFactor, BlendingFactor)) -> Vec 4 Float -> Blending Float
 testdata/record01.reject.lc 2:16-2:81  Vec 4 Float -> Blending Float
 testdata/record01.reject.lc 2:16-2:102  Blending Float
-testdata/record01.reject.lc 2:22-2:23  V1
+testdata/record01.reject.lc 2:22-2:23  b_
 testdata/record01.reject.lc 2:24-2:81  ((BlendingFactor, BlendingFactor), (BlendingFactor, BlendingFactor))
 testdata/record01.reject.lc 2:25-2:52  (BlendingFactor, BlendingFactor)
 testdata/record01.reject.lc 2:26-2:34  BlendingFactor
@@ -96,21 +96,21 @@ testdata/record01.reject.lc 8:55-8:66  {a:Nat} -> {b} -> {c} -> {_ : Num b} -> {
 testdata/record01.reject.lc 8:55-8:74  ((Image 1 ('Color (VecScalar 4 Float)))) | Image 1 ('Color (VecScalar 4 Float))
 testdata/record01.reject.lc 8:67-8:74  VecS Float 4
 testdata/record01.reject.lc 9:23-9:34  {a} -> Float -> PolygonMode a
-testdata/record01.reject.lc 9:23-9:39  PolygonMode V0
+testdata/record01.reject.lc 9:23-9:39  PolygonMode a_
 testdata/record01.reject.lc 9:35-9:39  Float
 testdata/record01.reject.lc 10:23-10:34  {a} -> PolygonMode a
 testdata/record01.reject.lc 11:23-11:35  {a} -> PointSize a -> PolygonMode a
-testdata/record01.reject.lc 11:23-11:52  PolygonMode V0
+testdata/record01.reject.lc 11:23-11:52  PolygonMode a_
 testdata/record01.reject.lc 11:37-11:46  {a} -> Float -> PointSize a
-testdata/record01.reject.lc 11:37-11:51  PointSize V0
+testdata/record01.reject.lc 11:37-11:51  PointSize a_
 testdata/record01.reject.lc 11:47-11:51  Float
 testdata/record01.reject.lc 12:10-12:18  CullMode
 testdata/record01.reject.lc 13:11-13:20  CullMode
 testdata/record01.reject.lc 14:23-14:34  {a} -> CullMode -> PolygonMode a -> PolygonOffset -> ProvokingVertex -> RasterContext a 'Triangle
-testdata/record01.reject.lc 14:23-14:39  PolygonMode V0 -> PolygonOffset -> ProvokingVertex -> RasterContext V3 'Triangle
-testdata/record01.reject.lc 14:23-14:49  PolygonOffset -> ProvokingVertex -> RasterContext V2 'Triangle
-testdata/record01.reject.lc 14:23-14:58  ProvokingVertex -> RasterContext V1 'Triangle
-testdata/record01.reject.lc 14:23-14:70  RasterContext V0 'Triangle
+testdata/record01.reject.lc 14:23-14:39  PolygonMode a_ -> PolygonOffset -> ProvokingVertex -> RasterContext d_ 'Triangle
+testdata/record01.reject.lc 14:23-14:49  PolygonOffset -> ProvokingVertex -> RasterContext c_ 'Triangle
+testdata/record01.reject.lc 14:23-14:58  ProvokingVertex -> RasterContext b_ 'Triangle
+testdata/record01.reject.lc 14:23-14:70  RasterContext a_ 'Triangle
 testdata/record01.reject.lc 14:35-14:39  CullMode
 testdata/record01.reject.lc 14:40-14:49  {a} -> PolygonMode a
 testdata/record01.reject.lc 14:50-14:58  PolygonOffset
@@ -124,7 +124,7 @@ testdata/record01.reject.lc 15:44-15:61  FragmentOperation 'Depth
 testdata/record01.reject.lc 15:52-15:56  ComparisonFunction
 testdata/record01.reject.lc 15:57-15:61  Bool
 testdata/record01.reject.lc 15:63-15:70  {a} -> {b:Nat} -> {_ : Num a} -> Blending a -> VecScalar b Bool -> FragmentOperation ('Color (VecScalar b a))
-testdata/record01.reject.lc 15:63-15:76  VecScalar V1 Bool -> FragmentOperation ('Color (VecScalar V2 Float))
+testdata/record01.reject.lc 15:63-15:76  VecScalar b_ Bool -> FragmentOperation ('Color (VecScalar c_ Float))
 testdata/record01.reject.lc 15:63-15:101  ((FragmentOperation ('Color (VecScalar 4 Float)))) | FragmentOperation ('Color (VecScalar 4 Float))
 testdata/record01.reject.lc 15:71-15:76  Blending Float
 testdata/record01.reject.lc 15:78-15:80  {a} -> a -> a -> a -> a -> VecS a 4
@@ -137,50 +137,50 @@ testdata/record01.reject.lc 15:86-15:90  Bool
 testdata/record01.reject.lc 15:91-15:95  Bool
 testdata/record01.reject.lc 15:96-15:100  Bool
 testdata/record01.reject.lc 16:23-16:30  {a} -> String->a
-testdata/record01.reject.lc 16:23-16:36  V0
+testdata/record01.reject.lc 16:23-16:36  a_
 testdata/record01.reject.lc 16:31-16:36  String
 testdata/record01.reject.lc 16:40-16:43  Nat -> Nat -> Type->Type
 testdata/record01.reject.lc 16:40-16:45  Nat -> Type->Type
 testdata/record01.reject.lc 16:40-16:47  Type->Type
 testdata/record01.reject.lc 16:40-16:53  Type
-testdata/record01.reject.lc 16:44-16:45  V1
-testdata/record01.reject.lc 16:46-16:47  V1
+testdata/record01.reject.lc 16:44-16:45  b_
+testdata/record01.reject.lc 16:46-16:47  b_
 testdata/record01.reject.lc 16:48-16:53  Type
-testdata/record01.reject.lc 17:27-17:61  (VecS Float 4, VecS Float 4) | HList V2 -> V2 | V2 -> HList V2 -> V2
+testdata/record01.reject.lc 17:27-17:61  (VecS Float 4, VecS Float 4) | HList c_ -> c_ | c_ -> HList c_ -> c_
 testdata/record01.reject.lc 17:28-17:41  {a:Nat} -> {b:Nat} -> {c} -> Mat a b c -> Vec b c -> Vec a c
 testdata/record01.reject.lc 17:28-17:55  Vec 4 Float -> Vec 4 Float
 testdata/record01.reject.lc 17:28-17:57  Vec 4 Float
 testdata/record01.reject.lc 17:42-17:55  Mat 4 4 Float
-testdata/record01.reject.lc 17:56-17:57  V6
+testdata/record01.reject.lc 17:56-17:57  g_
 testdata/record01.reject.lc 17:59-17:60  ((VecS Float 4)) | VecS Float 4
 testdata/record01.reject.lc 18:23-18:28  {a:PrimitiveType} -> {b : List Type} -> String -> HList b -> PrimitiveStream a (HList b)
-testdata/record01.reject.lc 18:23-18:37  HList V0 -> PrimitiveStream V2 (HList V1)
-testdata/record01.reject.lc 18:23-18:79  PrimitiveStream V0 ((Vec 4 Float))
+testdata/record01.reject.lc 18:23-18:37  HList a_ -> PrimitiveStream c_ (HList b_)
+testdata/record01.reject.lc 18:23-18:79  PrimitiveStream a_ ((Vec 4 Float))
 testdata/record01.reject.lc 18:29-18:37  String
 testdata/record01.reject.lc 18:39-18:48  {a} -> String->a
-testdata/record01.reject.lc 18:39-18:59  V0
+testdata/record01.reject.lc 18:39-18:59  a_
 testdata/record01.reject.lc 18:39-18:78  ((Vec 4 Float))
 testdata/record01.reject.lc 18:49-18:59  String
 testdata/record01.reject.lc 18:63-18:78  Type
 testdata/record01.reject.lc 18:65-18:68  Nat -> Type->Type
 testdata/record01.reject.lc 18:65-18:70  Type->Type
 testdata/record01.reject.lc 18:65-18:76  List Type | Type
-testdata/record01.reject.lc 18:69-18:70  V1
+testdata/record01.reject.lc 18:69-18:70  b_
 testdata/record01.reject.lc 18:71-18:76  Type
 testdata/record01.reject.lc 19:23-19:36  {a} -> {b} -> {c:PrimitiveType} -> a->b -> List (Primitive a c) -> List (Primitive b c)
-testdata/record01.reject.lc 19:23-19:49  List (Primitive ((VecS Float 4)) V0) -> List (Primitive (VecS Float 4, VecS Float 4) V1)
-testdata/record01.reject.lc 19:23-19:62  List (Primitive (VecS Float 4, VecS Float 4) V0)
+testdata/record01.reject.lc 19:23-19:49  List (Primitive ((VecS Float 4)) a_) -> List (Primitive (VecS Float 4, VecS Float 4) b_)
+testdata/record01.reject.lc 19:23-19:62  List (Primitive (VecS Float 4, VecS Float 4) a_)
 testdata/record01.reject.lc 19:37-19:49  ((VecS Float 4))->(VecS Float 4, VecS Float 4)
 testdata/record01.reject.lc 19:50-19:62  {a:PrimitiveType} -> PrimitiveStream a ((Vec 4 Float))
 testdata/record01.reject.lc 20:23-20:42  {a : List Type} -> {b:PrimitiveType} -> RasterContext (HList ('Cons (Vec 4 Float) a)) b -> HList ('map Type Type Interpolated a) -> List (Primitive (HList ('Cons (Vec 4 Float) a)) b) -> List (Vector 1 (Maybe (SimpleFragment (HList a))))
-testdata/record01.reject.lc 20:23-20:52  HList ('map Type Type Interpolated V0) -> List (Primitive (HList ('Cons (Vec 4 Float) V1)) 'Triangle) -> List (Vector 1 (Maybe (SimpleFragment (HList V2))))
-testdata/record01.reject.lc 20:23-20:63  List (Primitive (HList ('Cons (Vec 4 Float) V3)) 'Triangle) -> List (Vector 1 (Maybe (SimpleFragment (HList V4))))
+testdata/record01.reject.lc 20:23-20:52  HList ('map Type Type Interpolated a_) -> List (Primitive (HList ('Cons (Vec 4 Float) b_)) 'Triangle) -> List (Vector 1 (Maybe (SimpleFragment (HList c_))))
+testdata/record01.reject.lc 20:23-20:63  List (Primitive (HList ('Cons (Vec 4 Float) d_)) 'Triangle) -> List (Vector 1 (Maybe (SimpleFragment (HList e_))))
 testdata/record01.reject.lc 20:23-20:79  List (Vector 1 (Maybe (SimpleFragment ((VecS Float 4)))))
 testdata/record01.reject.lc 20:43-20:52  {a} -> RasterContext a 'Triangle
-testdata/record01.reject.lc 20:53-20:63  ((Interpolated V2))
+testdata/record01.reject.lc 20:53-20:63  ((Interpolated c_))
 testdata/record01.reject.lc 20:55-20:61  {a} -> {_ : Floating a} -> Interpolated a
 testdata/record01.reject.lc 20:64-20:79  {a:PrimitiveType} -> List (Primitive (VecS Float 4, VecS Float 4) a)
-testdata/record01.reject.lc 21:33-21:55  ((VecS Float 4)) | HList V2 -> V2 | V2 -> HList V2 -> V2
+testdata/record01.reject.lc 21:33-21:55  ((VecS Float 4)) | HList c_ -> c_ | c_ -> HList c_ -> c_
 testdata/record01.reject.lc 21:35-21:37  {a} -> a -> a -> a -> a -> VecS a 4
 testdata/record01.reject.lc 21:35-21:41  Float -> Float -> Float -> VecS Float 4
 testdata/record01.reject.lc 21:35-21:45  Float -> Float -> VecS Float 4
@@ -190,11 +190,11 @@ testdata/record01.reject.lc 21:38-21:41  Float
 testdata/record01.reject.lc 21:42-21:45  Float
 testdata/record01.reject.lc 21:46-21:49  Float
 testdata/record01.reject.lc 21:50-21:53  Float
-testdata/record01.reject.lc 22:33-22:67  ((VecS Float 4)) | HList V2 -> V2 | V2 -> HList V2 -> V2
+testdata/record01.reject.lc 22:33-22:67  ((VecS Float 4)) | HList c_ -> c_ | c_ -> HList c_ -> c_
 testdata/record01.reject.lc 22:35-22:42  {a} -> {_ : Num (MatVecScalarElem a)} -> a -> a->a
-testdata/record01.reject.lc 22:35-22:44  V8->V9
+testdata/record01.reject.lc 22:35-22:44  i_->j_
 testdata/record01.reject.lc 22:35-22:65  VecS Float 4
-testdata/record01.reject.lc 22:43-22:44  V9
+testdata/record01.reject.lc 22:43-22:44  j_
 testdata/record01.reject.lc 22:46-22:48  {a} -> a -> a -> a -> a -> VecS a 4
 testdata/record01.reject.lc 22:46-22:52  Float -> Float -> Float -> VecS Float 4
 testdata/record01.reject.lc 22:46-22:56  Float -> Float -> VecS Float 4
@@ -205,8 +205,8 @@ testdata/record01.reject.lc 22:53-22:56  Float
 testdata/record01.reject.lc 22:57-22:60  Float
 testdata/record01.reject.lc 22:61-22:64  Float
 testdata/record01.reject.lc 23:23-23:33  {a:Nat} -> {b : List Type} -> {c} -> HList b -> (c -> HList ('imageType' ('map Type ImageKind FragmentOperationKind b))) -> List (Vector a (Maybe (SimpleFragment c))) -> FrameBuffer a ('map Type ImageKind FragmentOperationKind b) -> FrameBuffer a ('map Type ImageKind FragmentOperationKind b)
-testdata/record01.reject.lc 23:23-23:45  V0->(('imageType (FragmentOperationKind (FragmentOperation ('Color (VecScalar 4 Float)))))) -> List (Vector V2 (Maybe (SimpleFragment V1))) -> FrameBuffer V3 ('map Type ImageKind FragmentOperationKind ('Cons (FragmentOperation 'Depth) ('Cons (FragmentOperation ('Color (VecScalar 4 Float))) 'Nil))) -> FrameBuffer V4 ('map Type ImageKind FragmentOperationKind ('Cons (FragmentOperation 'Depth) ('Cons (FragmentOperation ('Color (VecScalar 4 Float))) 'Nil)))
-testdata/record01.reject.lc 23:23-23:60  List (Vector V0 (Maybe (SimpleFragment ((VecS Float 4))))) -> FrameBuffer V1 ('map Type ImageKind FragmentOperationKind ('Cons (FragmentOperation 'Depth) ('Cons (FragmentOperation ('Color (VecScalar 4 Float))) 'Nil))) -> FrameBuffer V2 ('map Type ImageKind FragmentOperationKind ('Cons (FragmentOperation 'Depth) ('Cons (FragmentOperation ('Color (VecScalar 4 Float))) 'Nil)))
+testdata/record01.reject.lc 23:23-23:45  a_->(('imageType (FragmentOperationKind (FragmentOperation ('Color (VecScalar 4 Float)))))) -> List (Vector c_ (Maybe (SimpleFragment b_))) -> FrameBuffer d_ ('map Type ImageKind FragmentOperationKind ('Cons (FragmentOperation 'Depth) ('Cons (FragmentOperation ('Color (VecScalar 4 Float))) 'Nil))) -> FrameBuffer e_ ('map Type ImageKind FragmentOperationKind ('Cons (FragmentOperation 'Depth) ('Cons (FragmentOperation ('Color (VecScalar 4 Float))) 'Nil)))
+testdata/record01.reject.lc 23:23-23:60  List (Vector a_ (Maybe (SimpleFragment ((VecS Float 4))))) -> FrameBuffer b_ ('map Type ImageKind FragmentOperationKind ('Cons (FragmentOperation 'Depth) ('Cons (FragmentOperation ('Color (VecScalar 4 Float))) 'Nil))) -> FrameBuffer c_ ('map Type ImageKind FragmentOperationKind ('Cons (FragmentOperation 'Depth) ('Cons (FragmentOperation ('Color (VecScalar 4 Float))) 'Nil)))
 testdata/record01.reject.lc 23:23-23:75  FrameBuffer 1 ('map Type ImageKind FragmentOperationKind ('Cons (FragmentOperation 'Depth) ('Cons (FragmentOperation ('Color (VecScalar 4 Float))) 'Nil))) -> FrameBuffer 1 ('map Type ImageKind FragmentOperationKind ('Cons (FragmentOperation 'Depth) ('Cons (FragmentOperation ('Color (VecScalar 4 Float))) 'Nil)))
 testdata/record01.reject.lc 23:23-23:83  FrameBuffer 1 ('map Type ImageKind FragmentOperationKind ('Cons (FragmentOperation 'Depth) ('Cons (FragmentOperation ('Color (VecScalar 4 Float))) 'Nil)))
 testdata/record01.reject.lc 23:34-23:45  (FragmentOperation 'Depth, FragmentOperation ('Color (VecScalar 4 Float)))
@@ -225,9 +225,9 @@ testdata/record01.reject.lc 24:34-24:57  (FrameBuffer 1 ('map Type ImageKind Fra
 testdata/record01.reject.lc 24:41-24:47  List RecItem | RecItem | String
 testdata/record01.reject.lc 24:49-24:57  (((BlendEquation, BlendEquation) -> Blending Float)) | (BlendEquation, BlendEquation) -> Blending Float
 testdata/record01.reject.lc 25:11-25:17  RecordC ('Cons ('RecItem "fieldA" Float) ('Cons ('RecItem "fieldB" (FrameBuffer 1 ('map Type ImageKind FragmentOperationKind ('Cons (FragmentOperation 'Depth) ('Cons (FragmentOperation ('Color (VecScalar 4 Float))) 'Nil))))) ('Cons ('RecItem "fieldC" ((BlendEquation, BlendEquation) -> Blending Float)) 'Nil)))
-testdata/record01.reject.lc 25:11-25:24  V1
+testdata/record01.reject.lc 25:11-25:24  b_
 testdata/record01.reject.lc 25:18-25:24  String
 testdata/record01.reject.lc 26:5-26:14  {a:Nat} -> {b : List ImageKind} -> FrameBuffer a b -> Output
 testdata/record01.reject.lc 26:15-26:21  RecordC ('Cons ('RecItem "fieldA" Float) ('Cons ('RecItem "fieldB" (FrameBuffer 1 ('map Type ImageKind FragmentOperationKind ('Cons (FragmentOperation 'Depth) ('Cons (FragmentOperation ('Color (VecScalar 4 Float))) 'Nil))))) ('Cons ('RecItem "fieldC" ((BlendEquation, BlendEquation) -> Blending Float)) 'Nil)))
-testdata/record01.reject.lc 26:15-26:28  V1
+testdata/record01.reject.lc 26:15-26:28  b_
 testdata/record01.reject.lc 26:22-26:28  String
diff --git a/testdata/traceTest.out b/testdata/traceTest.out
index 154a8308..b2893066 100644
--- a/testdata/traceTest.out
+++ b/testdata/traceTest.out
@@ -7,15 +7,15 @@ match'X :: (a : Type->Type) -> ({b} -> c:b -> a ('X b c)) -> d:Type -> a d
 x :: 'X (Type -> Type->Type) (\a:Type b:Type -> (a, b))
 ------------ tooltips
 testdata/traceTest.lc 6:1-6:3  {a} -> a->a
-testdata/traceTest.lc 6:8-6:9  V1
+testdata/traceTest.lc 6:8-6:9  b_
 testdata/traceTest.lc 8:6-8:7  Type | {a} -> a->Type
 testdata/traceTest.lc 8:6-8:18  Type
 testdata/traceTest.lc 8:17-8:18  Type
 testdata/traceTest.lc 10:6-10:7  {a} -> a->Type
 testdata/traceTest.lc 10:6-10:25  Type
 testdata/traceTest.lc 10:17-10:24  Type
-testdata/traceTest.lc 10:19-10:20  V4
+testdata/traceTest.lc 10:19-10:20  e_
 testdata/traceTest.lc 10:19-10:23  List Type
-testdata/traceTest.lc 10:22-10:23  List Type | V2
+testdata/traceTest.lc 10:22-10:23  List Type | c_
 testdata/traceTest.lc 11:1-11:2  X (Type -> Type->Type) (\a:Type b:Type -> (a, b))
 testdata/traceTest.lc 11:5-11:14  {a}->a
diff --git a/testdata/typeclass.out b/testdata/typeclass.out
index e0e1f4c7..36725be0 100644
--- a/testdata/typeclass.out
+++ b/testdata/typeclass.out
@@ -12,11 +12,11 @@ testdata/typeclass.lc 8:12-8:17  Bool
 testdata/typeclass.lc 8:12-9:17  Bool->Bool
 testdata/typeclass.lc 9:13-9:17  Bool
 testdata/typeclass.lc 11:6-11:8  Bool -> Bool->Bool
-testdata/typeclass.lc 11:13-11:14  V1
+testdata/typeclass.lc 11:13-11:14  b_
 testdata/typeclass.lc 11:13-12:19  Bool->Bool
 testdata/typeclass.lc 12:14-12:19  Bool
 testdata/typeclass.lc 14:7-14:9  Bool -> Bool->Bool
-testdata/typeclass.lc 14:14-14:15  V2
+testdata/typeclass.lc 14:14-14:15  c_
 testdata/typeclass.lc 14:14-15:17  Bool->Bool
 testdata/typeclass.lc 15:13-15:17  Bool
 testdata/typeclass.lc 17:7-17:9  Type->Type
@@ -30,13 +30,13 @@ testdata/typeclass.lc 18:23-18:27  Type
 testdata/typeclass.lc 20:3-20:5  {a} -> {_ : Eq a} -> a -> a->Bool
 testdata/typeclass.lc 20:10-20:13  Bool->Bool
 testdata/typeclass.lc 20:10-20:22  Bool
-testdata/typeclass.lc 20:15-20:16  V5
-testdata/typeclass.lc 20:15-20:19  V4->Bool
+testdata/typeclass.lc 20:15-20:16  f_
+testdata/typeclass.lc 20:15-20:19  e_->Bool
 testdata/typeclass.lc 20:15-20:21  Bool
 testdata/typeclass.lc 20:17-20:19  {a} -> {_ : Eq a} -> a -> a->Bool
-testdata/typeclass.lc 20:20-20:21  V2
+testdata/typeclass.lc 20:20-20:21  c_
 testdata/typeclass.lc 23:17-23:18  Bool
-testdata/typeclass.lc 23:17-24:23  Bool->Bool | {_ : Eq V0} -> V1 -> V2->Bool | {a} -> {_ : Eq a} -> a -> a->Bool
+testdata/typeclass.lc 23:17-24:23  Bool->Bool | {_ : Eq a_} -> b_ -> c_->Bool | {a} -> {_ : Eq a} -> a -> a->Bool
 testdata/typeclass.lc 24:18-24:21  Bool->Bool
 testdata/typeclass.lc 24:18-24:23  Bool
-testdata/typeclass.lc 24:22-24:23  V1
+testdata/typeclass.lc 24:22-24:23  b_
diff --git a/testdata/typesig.reject.out b/testdata/typesig.reject.out
index 7d9272bc..f6a0fd30 100644
--- a/testdata/typesig.reject.out
+++ b/testdata/typesig.reject.out
@@ -1,16 +1,16 @@
 focus checkMetas: \a -> (\b:Type -> primFix a b) (\(a:=Type) -> \c:Type -> <<HERE>>)
-\(a : Type~V0) (b : V1~'X) -> typeAnn V2 (labend X)
+\(a : Type~a_) (b : b_~'X) -> typeAnn c_ (labend X)
 ------------ trace
 'X :: Type
 X :: 'X
 'XCase :: (a : 'X->Type) -> a X -> b:'X -> a b
 match'X :: (a : Type->Type) -> a 'X -> b:Type -> a b -> a b
 !focus checkMetas: \a -> (\b:Type -> primFix a b) (\(a:=Type) -> \c:Type -> <<HERE>>)
-\(a : Type~V0) (b : V1~'X) -> typeAnn V2 (labend X)
+\(a : Type~a_) (b : b_~'X) -> typeAnn c_ (labend X)
 ------------ tooltips
 testdata/typesig.reject.lc 4:6-4:7  Type
 testdata/typesig.reject.lc 4:6-4:11  Type
 testdata/typesig.reject.lc 4:10-4:11  X
-testdata/typesig.reject.lc 6:6-6:7  V1
-testdata/typesig.reject.lc 6:6-7:6  V0->V1 | V2
+testdata/typesig.reject.lc 6:6-6:7  b_
+testdata/typesig.reject.lc 6:6-7:6  a_->b_ | c_
 testdata/typesig.reject.lc 7:5-7:6  X
diff --git a/testdata/zip01.out b/testdata/zip01.out
index 7ceab8e3..c77e525e 100644
--- a/testdata/zip01.out
+++ b/testdata/zip01.out
@@ -4,11 +4,11 @@ zip2 :: {a} -> {b} -> 'List a -> 'List b -> 'List (a, b)
 ------------ tooltips
 testdata/zip01.lc 1:9-1:12  Type
 testdata/zip01.lc 1:9-1:30  Type
-testdata/zip01.lc 1:9-4:40  V0->V1 | {a} -> {b} -> List a -> List b -> List (a, b)
-testdata/zip01.lc 1:10-1:11  V3
+testdata/zip01.lc 1:9-4:40  a_->b_ | {a} -> {b} -> List a -> List b -> List (a, b)
+testdata/zip01.lc 1:10-1:11  d_
 testdata/zip01.lc 1:16-1:19  Type
 testdata/zip01.lc 1:16-1:30  Type
-testdata/zip01.lc 1:17-1:18  V2
+testdata/zip01.lc 1:17-1:18  c_
 testdata/zip01.lc 1:23-1:30  Type
 testdata/zip01.lc 1:24-1:29  Type
 testdata/zip01.lc 1:25-1:26  Type
@@ -16,17 +16,17 @@ testdata/zip01.lc 1:25-1:28  List Type
 testdata/zip01.lc 1:27-1:28  List Type | Type
 testdata/zip01.lc 2:1-2:5  {a} -> {b} -> List a -> List b -> List (a, b)
 testdata/zip01.lc 2:22-2:24  {a} -> List a
-testdata/zip01.lc 2:22-4:40  List (V3, V2) | List V0 -> List (V1, V4) | List V1 -> List (V3, V2) | List V1 -> List V1 -> List (V3, V2)
+testdata/zip01.lc 2:22-4:40  List (d_, c_) | List a_ -> List (b_, e_) | List b_ -> List (d_, c_) | List b_ -> List b_ -> List (d_, c_)
 testdata/zip01.lc 3:22-3:24  {a} -> List a
-testdata/zip01.lc 3:22-4:40  List (V2, V5) | List V0 -> List (V5, V1) | List V2 -> List V2 | V1 -> List V2 -> List V2
-testdata/zip01.lc 4:22-4:27  (V7, V3)
-testdata/zip01.lc 4:22-4:29  List (V7, V3) -> List (V8, V4)
-testdata/zip01.lc 4:22-4:40  List (V6, V2) | List V2 -> List V2 | V1 -> List V2 -> List V2
-testdata/zip01.lc 4:23-4:24  V10
-testdata/zip01.lc 4:25-4:26  ((V3)) | V6
+testdata/zip01.lc 3:22-4:40  List (c_, f_) | List a_ -> List (f_, b_) | List c_ -> List c_ | b_ -> List c_ -> List c_
+testdata/zip01.lc 4:22-4:27  (h_, d_)
+testdata/zip01.lc 4:22-4:29  List (h_, d_) -> List (i_, e_)
+testdata/zip01.lc 4:22-4:40  List (g_, c_) | List c_ -> List c_ | b_ -> List c_ -> List c_
+testdata/zip01.lc 4:23-4:24  k_
+testdata/zip01.lc 4:25-4:26  ((d_)) | g_
 testdata/zip01.lc 4:28-4:29  {a} -> a -> List a -> List a
 testdata/zip01.lc 4:30-4:34  {a} -> {b} -> List a -> List b -> List (a, b)
-testdata/zip01.lc 4:30-4:37  List V0 -> List (V8, V1)
-testdata/zip01.lc 4:30-4:40  List (V6, V2)
-testdata/zip01.lc 4:35-4:37  List V8
-testdata/zip01.lc 4:38-4:40  List V2
+testdata/zip01.lc 4:30-4:37  List a_ -> List (i_, b_)
+testdata/zip01.lc 4:30-4:40  List (g_, c_)
+testdata/zip01.lc 4:35-4:37  List i_
+testdata/zip01.lc 4:38-4:40  List c_