Test Trac #8963

2 files changed, 10 insertions, 0 deletions

diff --git a/testsuite/tests/deriving/should_compile/T8963.hs b/testsuite/tests/deriving/should_compile/T8963.hs
new file mode 100644
index 0000000000..78dcf469e8
--- /dev/null
+++ b/testsuite/tests/deriving/should_compile/T8963.hs
@@ -0,0 +1,9 @@
+{-# LANGUAGE TypeFamilies, GeneralizedNewtypeDeriving #-}
+
+module T8963 where
+
+class C c where
+   data F c r
+
+instance C Int where
+   newtype F Int r = F (IO r) deriving (Functor)
diff --git a/testsuite/tests/deriving/should_compile/all.T b/testsuite/tests/deriving/should_compile/all.T
index c8ee7faa3c..224b99ef00 100644
--- a/testsuite/tests/deriving/should_compile/all.T
+++ b/testsuite/tests/deriving/should_compile/all.T
@@ -48,3 +48,4 @@ test('T8678', normal, compile, [''])
 test('T8865', normal, compile, [''])
 test('T8893', normal, compile, [''])
 test('T8950', expect_broken(8950), compile, [''])
+test('T8963', normal, compile, [''])