diff -r 000000000000 -r 6474c204b198 dom/bindings/parser/tests/test_incomplete_parent.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/bindings/parser/tests/test_incomplete_parent.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+import WebIDL
+
+def WebIDLTest(parser, harness):
+    parser.parse("""
+        interface TestIncompleteParent : NotYetDefined {
+          void foo();
+        };
+
+        interface NotYetDefined : EvenHigherOnTheChain {
+        };
+
+        interface EvenHigherOnTheChain {
+        };
+    """)
+
+    parser.finish()
+
+    harness.ok(True, "TestIncompleteParent interface parsed without error.")