diff --git a/testdata/parser/negative/27.txt b/testdata/parser/negative/27.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2d77c49e26197b389c54f6514875a7b277a3c2ce
--- /dev/null
+++ b/testdata/parser/negative/27.txt
@@ -0,0 +1,3 @@
+Parse error at 27.pdl:6:1: Duplicate label
+dupl:	while (a < 10) {
+^