diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBug555484.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBug555484.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+var result = "";
+o = { valueOf:function(){ throw "cow" } };
+try {
+    String.fromCharCode(o);
+} catch (e) {
+    result = e.toString();
+}
+assertEq(result, "cow");