diff --git a/testdata/parser/negative/1.pdl b/testdata/parser/negative/1.pdl
new file mode 100644
index 0000000000000000000000000000000000000000..4f0fafc1f9d3ade96980f3dd09e93b65e97225e7
--- /dev/null
+++ b/testdata/parser/negative/1.pdl
@@ -0,0 +1,10 @@
+#version 100
+
+// sync block nested twice in primitive
+primitive main(in a, out b) {
+	while (true) {
+		synchronous {
+			synchronous {}
+		}
+	}
+}