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{-# LANGUAGE TypeFamilies #-}
-- In an ideal world, this would work. But, GHC doesn't implement
-- a full infinite-type unifier, so it can't figure out that F b [b] Bool
-- can safely reduce to Bool.
module Overlap15 where
import Data.Proxy
type family F a b c where
F a a a = Int
F b c Bool = Bool
foo :: Proxy b -> F b [b] Bool
foo _ = False
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