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T11355.hs:5:7: error:
• Illegal polymorphic type: forall (a :: TYPE t0). a
GHC doesn't yet support impredicative polymorphism
• In the expression:
const @_ @((forall a. a) -> forall a. a) () (id @(forall a. a))
In an equation for ‘foo’:
foo
= const @_ @((forall a. a) -> forall a. a) () (id @(forall a. a))
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