1 files changed, 15 insertions, 0 deletions
diff --git a/testsuite/tests/quantified-constraints/T15231.hs b/testsuite/tests/quantified-constraints/T15231.hs
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index 0000000000..7b7834d1f2
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+++ b/testsuite/tests/quantified-constraints/T15231.hs
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+{-# LANGUAGE ConstraintKinds #-}
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE KindSignatures #-}
+{-# LANGUAGE QuantifiedConstraints #-}
+module Bug where
+
+import Data.Kind
+
+data ECC :: Constraint -> Type -> Type
+
+class Y a
+class Z a
+
+instance  c         => Y (ECC c a)
+instance (c => Z a) => Z (ECC c a)