Test #7481, which had already been fixed.

testsuite/tests/polykinds/T7481.hs

+ {-# LANGUAGE DataKinds, PolyKinds, RankNTypes, GADTs #-}
+
+module T7481 where
+
+import Data.Proxy
+
+data D a where
+  D1 :: a -> D a
+  D2 :: (a~Int) => D a
+  D3 :: forall (a::k) b. Proxy a -> D b
+
+data Foo :: D * -> *
\ No newline at end of file

testsuite/tests/polykinds/T7481.stderr

+
+T7481.hs:12:13:
+    ‛D’ of kind ‛* -> *’ is not promotable
+    In the kind ‛D * -> *’

testsuite/tests/polykinds/all.T

@@ -97,3 +97,4 @@ test('T8534', normal, compile, [''])
 test('T8566', normal, compile_fail,[''])
 test('T8616', normal, compile_fail,[''])
 test('T8566a', expect_broken(8566), compile,[''])
+test('T7481', normal, compile_fail,[''])
\ No newline at end of file