diff --git a/testdata/parser/negative/25.txt b/testdata/parser/negative/25.txt
new file mode 100644
index 0000000000000000000000000000000000000000..770f8b706322074a3e9111379e93ff6092545d22
--- /dev/null
+++ b/testdata/parser/negative/25.txt
@@ -0,0 +1,3 @@
+Parse error at 25.pdl:7:20: Declared variable clash
+		synchronous (int x) { // illegal
+		                 ^