v8/test/mjsunit/es6/regress/regress-2225.js

// Copyright 2012 the V8 project authors. All rights reserved.
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var proxy_has_x = false;
var proxy = new Proxy({}, {
  get(t, key, receiver) {
    assertSame('x', key);
    if (proxy_has_x) { return 19 }
    return 8;
  }
});

// Test __lookupGetter__/__lookupSetter__ with proxy.
assertSame(undefined, Object.prototype.__lookupGetter__.call(proxy, 'foo'));
assertSame(undefined, Object.prototype.__lookupSetter__.call(proxy, 'bar'));
assertSame(undefined, Object.prototype.__lookupGetter__.call(proxy, '123'));
assertSame(undefined, Object.prototype.__lookupSetter__.call(proxy, '456'));

// Test __lookupGetter__/__lookupSetter__ with proxy in prototype chain.
var object = Object.create(proxy);
assertSame(undefined, Object.prototype.__lookupGetter__.call(object, 'foo'));
assertSame(undefined, Object.prototype.__lookupSetter__.call(object, 'bar'));
assertSame(undefined, Object.prototype.__lookupGetter__.call(object, '123'));
assertSame(undefined, Object.prototype.__lookupSetter__.call(object, '456'));

// Test inline constructors with proxy as prototype.
function F() { this.x = 42 }
F.prototype = proxy;
var instance = new F();

proxy_has_x = false;
assertSame(42, instance.x);
delete instance.x;
assertSame(8, instance.x);

proxy_has_x = true;
assertSame(19, instance.x);

// Test inline constructors with proxy in prototype chain.
function G() { this.x = 42; }
G.prototype.__proto__ = proxy;
instance = new G();

proxy_has_x = false;
assertSame(42, instance.x);
delete instance.x;
assertSame(8, instance.x);

proxy_has_x = true;
assertSame(19, instance.x);