testsuite/tests/gadt/T1999a.hs


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{-# LANGUAGE Haskell2010 #-}
{-# LANGUAGE GADTs #-}
-- #1999

module ShouldCompile where

data EqTypes a b where
  EqConstr :: EqTypes a b -> EqTypes (s a) (s b)

eqUnConstr :: EqTypes (s a) (s b) -> EqTypes a b
eqUnConstr (EqConstr eq) = eq