diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_8_1/regress/regress-530879.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_8_1/regress/regress-530879.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ * Contributor: Jason Orendorff
+ */
+function f(a, b, c, d) {
+    yield arguments.length;
+}
+reportCompare(0, f().next(), "bug 530879");