diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug913445.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug913445.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+// uneval works on objects with no callable .toSource method.
+
+var obj = Object.create(null);
+assertEq(uneval(obj), "({})");
+assertEq(Function.prototype.toSource.call(obj), "({})");
+obj.x = 1;
+obj.y = 2;
+assertEq(uneval(obj), "({x:1, y:2})");
+
+var d = new Date();
+delete Date.prototype.toSource;
+assertEq(uneval(d), "({})");
+
+delete Object.prototype.toSource;
+assertEq(uneval({p: 2+2}), "({p:4})");
+
+assertEq(uneval({toSource: [0]}), "({toSource:[0]})");