diff --git a/testdata/parser/negative/7.pdl b/testdata/parser/negative/7.pdl
new file mode 100644
index 0000000000000000000000000000000000000000..b37b28604db2ba82798625f4cbcb04ca35b8f69f
--- /dev/null
+++ b/testdata/parser/negative/7.pdl
@@ -0,0 +1,9 @@
+#version 100
+
+import std.reo;
+
+// shadowing formal parameter
+composite main(in a, out b) {
+	channel c -> a;
+	new sync(a, b);
+}