1 files changed, 18 insertions, 0 deletions
diff --git a/testsuite/tests/polykinds/T18855.hs b/testsuite/tests/polykinds/T18855.hs
new file mode 100644
index 0000000000..131cd9c8e7
--- /dev/null
+++ b/testsuite/tests/polykinds/T18855.hs
@@ -0,0 +1,18 @@
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE PolyKinds #-}
+{-# LANGUAGE RankNTypes #-}
+{-# LANGUAGE StandaloneKindSignatures #-}
+{-# LANGUAGE TypeFamilies #-}
+module Bug where
+
+import Data.Kind
+
+type family Apply (f :: a -> b) (x :: a) :: b
+
+type F :: forall a.
+          forall (p :: forall bOne. Either a bOne -> Type)
+       -> forall bTwo.
+          forall (e :: Either a bTwo)
+       -> Apply p e
+
+type family F