diff --git a/testdata/parser/negative/3.pdl b/testdata/parser/negative/3.pdl
new file mode 100644
index 0000000000000000000000000000000000000000..67caa9d0a862f387cb25a7d1c04c81df7eead3c3
--- /dev/null
+++ b/testdata/parser/negative/3.pdl
@@ -0,0 +1,11 @@
+#version 100
+
+// sync block nested deeply in composite
+composite main(in a, out b) {
+	channel x -> y;
+	while (true) {
+		synchronous {
+			skip;
+		}
+	}
+}