1 files changed, 15 insertions, 0 deletions
diff --git a/testsuite/tests/polykinds/T12668.hs b/testsuite/tests/polykinds/T12668.hs
new file mode 100644
index 0000000000..4640903cc5
--- /dev/null
+++ b/testsuite/tests/polykinds/T12668.hs
@@ -0,0 +1,15 @@
+{-# LANGUAGE TypeInType #-}
+{-# LANGUAGE RankNTypes #-}
+
+module T12668 where
+
+import GHC.Exts
+
+data Some r = Some (TYPE r -> TYPE r)
+
+doSomething :: forall (r :: RuntimeRep). forall (a :: TYPE r). ()
+            => Int -> (a -> Int) -> a -> a
+doSomething n f =
+    case n of
+      1 -> error "hello"
+      3 -> error "hello"