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| {-# LANGUAGE RankNTypes, TypeFamilies, ConstraintKinds #-} | |
| type family F x where | |
| F () = Int | |
| F x = Char | |
| class Foo x where | |
| foo :: x -> F x | |
| f :: (c (), Foo b) => proxy c -> (forall a . c a => a -> b) -> F b | |
| f _ g = foo (g ()) |
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