diff --git a/testdata/parser/negative/31.pdl b/testdata/parser/negative/31.pdl
new file mode 100644
index 0000000000000000000000000000000000000000..d4aa9911681b1145e612483995e90856766bca56
--- /dev/null
+++ b/testdata/parser/negative/31.pdl
@@ -0,0 +1,9 @@
+#version 100
+
+primitive main(int a) {
+    while (true) {
+        synchronous {
+            break; // not allowed
+        }
+    }
+}
\ No newline at end of file