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{-# LANGUAGE GADTs #-}
unit p where
signature H1 where
data T
signature H2 where
data T
module M where
import qualified H1
import qualified H2
-- This is NOT an insoluble given, so we
-- should complain a doesn't match b
f :: H1.T ~ H2.T => a -> b
f x = x
-- This equality does NOT hold, we should
-- complain that H1.T doesn't match H2.T
g :: H1.T -> H2.T
g x = x
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