diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/extensions/bug566661.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/extensions/bug566661.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,6 @@
+var f = function (q) { return q['\xC7']; }
+var d = eval(uneval(f));
+assertEq(d({'\xC7': 'good'}), 'good');
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);