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diff --git a/testsuite/tests/saks/should_compile/T16756a.hs b/testsuite/tests/saks/should_compile/T16756a.hs
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+{-# LANGUAGE StandaloneKindSignatures #-}
+{-# LANGUAGE TypeFamilies #-}
+
+module T16756a where
+
+import Data.Kind (Type)
+
+type T :: Type -> Type
+data family T
+ -- We do /not/ need to write:
+ -- data family T a
+ -- See https://gitlab.haskell.org/ghc/ghc/issues/16756#note_203567