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Type inequality constraint in Haskell
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| {-# LANGUAGE ConstraintKinds #-} | |
| {-# LANGUAGE DataKinds #-} | |
| {-# LANGUAGE TypeFamilies #-} | |
| {-# LANGUAGE TypeOperators #-} | |
| type family TypeEq a b where | |
| TypeEq a a = True | |
| TypeEq a b = False | |
| type a /= b = TypeEq a b ~ False | |
| f :: (a /= b) => (a -> b) -> a -> b | |
| f g a = g a |
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