diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Source-elementAttributeName.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Source-elementAttributeName.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+// Source.prototype.elementAttributeName can be a string or undefined.
+
+var g = newGlobal('new-compartment');
+var dbg = new Debugger;
+var gw = dbg.addDebuggee(g);
+g.evaluate("function f(x) { return 2*x; }", {elementAttributeName: "src"});
+var fw = gw.getOwnPropertyDescriptor('f').value;
+assertEq(fw.script.source.elementAttributeName, "src");
+g.evaluate("function f(x) { return 2*x; }");
+var fw = gw.getOwnPropertyDescriptor('f').value;
+assertEq(fw.script.source.elementAttributeName, undefined);