Test Trac #9023

(cherry picked from commit 616f54bd)

testsuite/tests/patsyn/should_compile/T9023.hs

+{-# LANGUAGE PatternSynonyms #-}
+
+module T9023 where
+
+pattern P a b = Just (a, b)
+foo P{} = True

testsuite/tests/patsyn/should_compile/all.T

@@ -9,3 +9,4 @@ test('num', normal, compile, [''])
 test('incomplete', normal, compile, [''])
 test('export', normal, compile, [''])
 test('T8966', normal, compile, [''])
+test('T9023', normal, compile, [''])