diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_8_5/extensions/compound-assign-const.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_8_5/extensions/compound-assign-const.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 730810;
+var summary = "Don't assert on compound assignment to a const";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+const x = 3;
+x += 2;
+assertEq(x, 3);
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete!");