1 files changed, 19 insertions, 0 deletions
diff --git a/dom/bindings/parser/tests/test_typedef_identifier_conflict.py b/dom/bindings/parser/tests/test_typedef_identifier_conflict.py
new file mode 100644
index 0000000000..90e45ddb7d
--- /dev/null
+++ b/dom/bindings/parser/tests/test_typedef_identifier_conflict.py
@@ -0,0 +1,19 @@
+def WebIDLTest(parser, harness):
+    exception = None
+    try:
+        parser.parse(
+            """
+            typedef long foo;
+            typedef long foo;
+            """
+        )
+
+        parser.finish()
+    except Exception as e:
+        exception = e
+
+    harness.ok(exception, "Should have thrown.")
+    harness.ok(
+        "Multiple unresolvable definitions of identifier 'foo'" in str(exception),
+        "Should have a sane exception message",
+    )