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------------ desugared source code
id = _lhs id \(a :: _) -> _rhs a

f = _lhs f \(a :: _) -> _rhs let b = id a in b
------------ core code
f :: forall a . a -> a
f = \a b -> _rhs b

id :: forall a . a -> a
id = \a b -> _rhs b
------------ tooltips
4:1-4:3
    forall a . a -> a
4:8-4:9
    _b
6:1-6:2
    forall a . a -> a
6:15-6:17
    forall a . a -> a
6:15-6:19
    _b
6:18-6:19
    _c
6:23-6:24
    _c