diff --git a/testsuite/tests/patsyn/should_fail/as-pattern.stderr b/testsuite/tests/patsyn/should_fail/as-pattern.stderr
new file mode 100644
index 0000000000000000000000000000000000000000..62db28f0236ad1054ee7cf663d42d353f3f8df36
--- /dev/null
+++ b/testsuite/tests/patsyn/should_fail/as-pattern.stderr
@@ -0,0 +1,4 @@
+
+as-pattern.hs:4:18:
+    Pattern synonym definition cannot contain as-patterns (@):
+      x@(Just y)