diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug792239.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug792239.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,6 @@
+var f = String.prototype.m = function () {
+    return [this.m, this];
+};
+var a = "s".m();
+gczeal(4);
+evaluate("for (a = 0; a < 13; a++) {}", { noScriptRval: true });