1 files changed, 9 insertions, 0 deletions
diff --git a/ipc/ipdl/test/ipdl/error/redeclParamReturn.ipdl b/ipc/ipdl/test/ipdl/error/redeclParamReturn.ipdl
new file mode 100644
index 0000000000..ccdcbbe0d1
--- /dev/null
+++ b/ipc/ipdl/test/ipdl/error/redeclParamReturn.ipdl
@@ -0,0 +1,9 @@
+//error: redeclaration of symbol `f', first declared at
+
+sync protocol redeclParamReturn {
+
+    // it's an error to name a parameter with the same id as a return
+
+parent: async Msg(int f) returns (bool f);
+
+};