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T12427a.hs:17:29: error:
• Couldn't match expected type ‘p’
with actual type ‘(forall b. [b] -> [b]) -> Int’
‘p’ is a rigid type variable bound by
the inferred type of h11 :: T -> p
at T12427a.hs:17:1-29
• In the expression: v
In a case alternative: T1 _ v -> v
In the expression: case y of { T1 _ v -> v }
• Relevant bindings include
h11 :: T -> p (bound at T12427a.hs:17:1)
T12427a.hs:28:6: error:
• Cannot instantiate unification variable ‘p0’
with a type involving polytypes: (forall b. [b] -> [b]) -> Int
GHC doesn't yet support impredicative polymorphism
• In the pattern: T1 _ x1
In a pattern binding: T1 _ x1 = undefined
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