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diff --git a/testsuite/tests/polykinds/T19739a.hs b/testsuite/tests/polykinds/T19739a.hs
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+{-# LANGUAGE PolyKinds #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE StandaloneKindSignatures #-}
+module Bug where
+
+import Data.Kind
+import Data.Proxy
+
+type T :: forall (a :: Type) -> Constraint
+class T a where
+ f :: Proxy a