diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug825705.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug825705.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+// Test 1: When constructing x, we shouldn't take the prototype for this.
+// it will crash if that happens
+evalcx("\
+    var x = newGlobal().Object;\
+    function f() { return new x; }\
+    f();\
+    f();\
+", newGlobal());
+
+// Test 2: Don't take the prototype of proxy's to create |this|,
+// as this will throw... Not expected behaviour.
+var O = new Proxy(function() {}, {
+    get: function() {
+	    throw "get trap";
+    }
+});
+
+function f() {
+  new O();
+}
+
+f();
+f();