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diff --git a/testsuite/tests/ghc-api/annotations/Test16230.hs b/testsuite/tests/ghc-api/annotations/Test16230.hs
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+++ b/testsuite/tests/ghc-api/annotations/Test16230.hs
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+{-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE KindSignatures #-}
+{-# LANGUAGE ExplicitForAll #-}
+{-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE TypeApplications #-}
+{-# LANGUAGE DataKinds #-}
+module MoreExplicitForalls where
+
+import Data.Proxy
+
+data family F1 a
+data instance forall (x :: Bool). F1 (Proxy x) = MkF
+
+class C a where
+  type F2 a b
+
+instance forall a. C [a] where
+  type forall b. F2 [a] b = Int
+
+
+type family G a b where
+  forall x y. G [x] (Proxy y) = Double
+  forall z.   G z   z         = Bool