src/third_party/mozjs-45/js/src/tests/test262/ch11/11.4/11.4.1/S11.4.1_A5.js

// Copyright 2011 Google Inc.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/**
 * A strict delete should either succeed, returning true, or it
 * should fail by throwing a TypeError. Under no circumstances
 * should a strict delete return false.
 *
 * @path ch11/11.4/11.4.1/S11.4.1_A5.js
 * @description See if a strict delete returns false when deleting a
 * non-standard property.
 * @onlyStrict
 */

"use strict";

var reNames = Object.getOwnPropertyNames(RegExp);
for (var i = 0, len = reNames.length; i < len; i++) {
  var reName = reNames[i];
  if (reName !== 'prototype') {
    var deleted = 'unassigned';
    try {
      deleted = delete RegExp[reName];
    } catch (err) {
      if (!(err instanceof TypeError)) {
        $ERROR('#1: strict delete threw a non-TypeError: ' + err);
      }
      // fall through
    }
    if (deleted === false) {
      $ERROR('#2: Strict delete returned false');
    }
  }
}