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kosmikus/TypeFamilies.hs

Created October 8, 2018 18:15
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Bug in ghc-8.6.1
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TypeFamilies.hs
{-# LANGUAGE TypeFamilies #-}
module TypeFamilies where
type family A (x :: *) :: * where
A x = x
type family B (x :: *) :: * where
A x = x -- note A, not B !!
-- ghc-8.6.1 accepts this program, whereas ghc-8.4.3 reports an error
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