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Created January 4, 2019 17:55
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typeable21.hs
data (a :: k1) :~~: (a :: k2) where
HRefl :: forall (a :: k). a :~~: a
eqT :: forall k1 k2 (a :: k1) (b :: k2)
. TypeRep a -> TypeRep b -> Maybe (a :~~: b)
eqT a b
| typeRepFingerprint a == typeRepFingerprint b = Just (unsafeCoerce Refl)
| otherwise = Nothing
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