var createBuiltin = $vm.createBuiltin; function shouldBe(actual, expected) { if (actual !== expected) throw new Error('bad value: ' + actual); } (function () { var builtin = createBuiltin(`(function (obj, value) { return @putByIdDirect(obj, "hello", value); })`); noInline(builtin); var setValue = null; var object = { __proto__: { hello: 30 } }; builtin(object, 42); shouldBe(object.hello, 42); shouldBe(object.hasOwnProperty("hello"), true); }());