diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Object-apply-04.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Object-apply-04.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+// Debugger.Object.prototype.apply/call works with function proxies
+
+var g = newGlobal();
+g.eval("function f() { debugger; }");
+var dbg = Debugger(g);
+var hits = 0;
+dbg.onDebuggerStatement = function (frame) {
+    var proxy = frame.arguments[0];
+    assertEq(proxy.name, undefined);
+    assertEq(proxy.apply(null, [33]).return, 34);
+    assertEq(proxy.call(null, 33).return, 34);
+    hits++;
+};
+g.eval("f(Proxy.createFunction({}, function (arg) { return arg + 1; }));");
+assertEq(hits, 1);