1 files changed, 29 insertions, 0 deletions
diff --git a/testsuite/tests/rep-poly/T21544.hs b/testsuite/tests/rep-poly/T21544.hs
new file mode 100644
index 0000000000..38793c8a15
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+++ b/testsuite/tests/rep-poly/T21544.hs
@@ -0,0 +1,29 @@
+
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE DatatypeContexts #-}
+{-# LANGUAGE MagicHash #-}
+{-# LANGUAGE PolyKinds #-}
+{-# LANGUAGE StandaloneKindSignatures #-}
+{-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE UnliftedNewtypes #-}
+
+module T21544 where
+
+import Data.Kind
+import GHC.Exts
+
+
+type N1 :: forall (r :: RuntimeRep) -> TYPE r -> TYPE r
+data family N1 r a
+newtype instance N1 r a = MkN1 a
+
+foo1 :: Int# -> N1 IntRep Int#
+foo1 = MkN1
+
+
+type N2 :: forall (r :: RuntimeRep) -> TYPE r -> Type -> Type -> Type -> TYPE r
+data family N2 r a i
+newtype instance Ord b => N2 r a Int b c = MkN2 a
+
+foo2 :: Ord b => Int# -> N2 IntRep Int# Int b c
+foo2 = MkN2