2 files changed, 12 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_compile/T18939_Compile.hs b/testsuite/tests/typecheck/should_compile/T18939_Compile.hs
new file mode 100644
index 0000000000..8c2123f111
--- /dev/null
+++ b/testsuite/tests/typecheck/should_compile/T18939_Compile.hs
@@ -0,0 +1,11 @@
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE PolyKinds #-}
+{-# LANGUAGE RankNTypes #-}
+{-# LANGUAGE StandaloneKindSignatures #-}
+{-# LANGUAGE TypeFamilies #-}
+module T18939_Compile where
+
+import Data.Kind
+
+data family   Hm :: forall a -> a -> Type
+data instance Hm :: forall a -> a -> Type
diff --git a/testsuite/tests/typecheck/should_compile/all.T b/testsuite/tests/typecheck/should_compile/all.T
index 263ff97ba1..4482e3fdc4 100644
--- a/testsuite/tests/typecheck/should_compile/all.T
+++ b/testsuite/tests/typecheck/should_compile/all.T
@@ -726,6 +726,7 @@ test('T18323', normal, compile, [''])
 test('T18585', normal, compile, [''])
 test('T18831', normal, compile, [''])
 test('T18920', normal, compile, [''])
+test('T18939_Compile', normal, compile, [''])
 test('T15942', normal, compile, [''])
 test('ClassDefaultInHsBoot', [extra_files(['ClassDefaultInHsBootA1.hs','ClassDefaultInHsBootA2.hs','ClassDefaultInHsBootA2.hs-boot','ClassDefaultInHsBootA3.hs'])], multimod_compile, ['ClassDefaultInHsBoot', '-v0'])
 test('T17186', normal, compile, [''])