diff --git a/testdata/parser/negative/6.txt b/testdata/parser/negative/6.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ad0990bd36ea84ed546ff9df09b8d40b3f1e4ef1
--- /dev/null
+++ b/testdata/parser/negative/6.txt
@@ -0,0 +1,3 @@
+Parse error at 6.pdl:6:26: Declared variable clash
+composite main(in a, out a) {
+                         ^