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------------ desugared source code
l = _lhs l (_rhs [(), (), (), ()])

value = _lhs value (_rhs (concatMap (\(a :: _) -> [a]) l))
------------ core code
l :: [()]
l = _rhs [(), (), (), ()]

value :: [()]
value = _rhs (() : [] ++ foldr (++) [] (map (\a -> [a]) [(), (), ()]))
------------ tooltips
1:1-1:2
    [()]
1:5-1:18
    [()]
1:6-1:8
    ()
1:9-1:11
    ()
1:9-1:17
    [()]
1:12-1:14
    ()
1:12-1:17
    [()]
1:15-1:17
    () | [()]
2:1-2:6
    [()]
2:9-2:21
    [()]
2:10-2:11
    _d | [_b]
2:19-2:20
    [()]