JSTests/test262/test/built-ins/RegExp/prototype/Symbol.match/g-match-empty-coerce-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 is thrown while type coercing `lastIndex` of zero-width
    match
es6id: 21.2.5.6
info: |
    7. If global is false, then
       [...]
    8. Else global is true,
       [...]
       g. Repeat,
          i. Let result be RegExpExec(rx, S).
          [...]
          iv. Else result is not null,
              1. Let matchStr be ToString(Get(result, "0")).
              [...]
              5. If matchStr is the empty String, then
                 a. Let thisIndex be ToLength(Get(rx, "lastIndex")).
                 b. ReturnIfAbrupt(thisIndex).
features: [Symbol.match]
---*/

var r = /./g;
var nextMatch;

r.exec = function() {
  var thisMatch = nextMatch;
  if (thisMatch === null) {
    return null;
  }
  nextMatch = null;
  return {
    get 0() {
      r.lastIndex = {
        valueOf: function() {
          throw new Test262Error();
        }
      };
      return thisMatch;
    }
  };
};

nextMatch = '';
assert.throws(Test262Error, function() {
  r[Symbol.match]('');
});