src/third_party/mozjs-45/js/src/jit-test/tests/debug/Object-apply-04.js

// 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);