Test Trac #5937

testsuite/tests/polykinds/T5937.hs

+{-# LANGUAGE PolyKinds, KindSignatures, DataKinds, GADTs #-}
+module T5937 where
+
+data SMaybe :: (k -> *) -> Maybe k -> * where
+   SNothing :: SMaybe s 'Nothing
+   SJust :: s a -> SMaybe s ('Just a)

testsuite/tests/polykinds/all.T

@@ -29,4 +29,5 @@ test('T5862', normal, compile, [''])
 test('T5912', normal, compile, [''])
 test('T5881', normal, run_command, ['$MAKE -s --no-print-directory T5881'])
 test('T5716', normal, compile_fail, [''])
+test('T5937', normal, compile, [''])