JSTests/test262/test/built-ins/RegExp/prototype/Symbol.match/builtin-success-g-set-lastindex-err.js

// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
description: >
    Behavior when error thrown while setting `lastIndex` after a "global" match
    success
es6id: 21.2.5.6
info: |
    [...]
    5. Let global be ToBoolean(Get(rx, "global")).
    6. ReturnIfAbrupt(global).
    7. If global is false, then
       a. Return RegExpExec(rx, S).

    21.2.5.2.1 Runtime Semantics: RegExpExec ( R, S )

    [...]
    7. Return RegExpBuiltinExec(R, S).

    21.2.5.2.2 Runtime Semantics: RegExpBuiltinExec ( R, S )

    [...]
    18. If global is true or sticky is true,
        a. Let setStatus be Set(R, "lastIndex", e, true).
        b. ReturnIfAbrupt(setStatus).
features: [Symbol.match]
---*/

var r = /b/g;
var callCount = 0;

// Because this test speicifically concerns the behavior when setting
// "lastIndex" following a match, care must be taken to avoid triggering a
// similar error when `lastIndex` is initially set to `0` earlier in the
// algorithm.
//
// Because the `lastIndex` property is non-configurable, this cannot be
// accomplished with a simple "set" accessor function.
//
// Defer disabling modification of `lastIndex` until after the "this" value's
// `exec` property has been accessed, ensuring that the resultant abrupt
// completion originates  from the second property modification.
Object.defineProperty(r, 'exec', {
  get: function() {
    Object.defineProperty(r, 'lastIndex', { writable: false });
  }
});

assert.throws(TypeError, function() {
  r[Symbol.match]('abc');
});