JSTests/test262/test/built-ins/Promise/resolve-function-extensible.js

// Copyright (C) 2015 André Bargull. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
es6id: 25.4.1.3.2
description: The [[Extensible]] slot of Promise Resolve functions
info: >
  17 ECMAScript Standard Built-in Objects:
    Unless specified otherwise, the [[Extensible]] internal slot
    of a built-in object initially has the value true.
---*/

var resolveFunction;
new Promise(function(resolve, reject) {
  resolveFunction = resolve;
});

assert(Object.isExtensible(resolveFunction));