diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testStringObjectLength.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testStringObjectLength.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,7 @@
+function testStringObjectLength() {
+    var x = new String("foo"), y = 0;
+    for (var i = 0; i < 10; ++i)
+        y = x.length;
+    return y;
+}
+assertEq(testStringObjectLength(), 3);