JSTests/test262/test/language/expressions/delete/11.4.1-4.a-8-s.js

// Copyright (c) 2012 Ecma International.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
info: |
    This test is actually testing the [[Delete]] internal method (8.12.8). Since the
    language provides no way to directly exercise [[Delete]], the tests are placed here.
es5id: 11.4.1-4.a-8-s
description: >
    delete operator throws TypeError when deleting a non-configurable
    data property in strict mode
flags: [onlyStrict]
---*/

var global = this;
  // NaN (15.1.1.1) has [[Configurable]] set to false.
assert.throws(TypeError, function() {
    delete global.NaN;
});