diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/testAddStringObject.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/testAddStringObject.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+String.prototype.m = function(s) {
+    return this.indexOf('a');
+};
+
+var g = function(s) {
+    return (s + 'asdf').m();
+};
+
+var h = function(s) {
+    return ('asdf' + s).m();
+};
+
+var ix = g(new String('abc'));
+assertEq(ix, 0);
+
+var ix = h(new String('abc'));
+assertEq(ix, 0);