babel/packages/babel-plugin-transform-regenerator/test/fixtures/regression/star-rhs-iter-rtrn-res-done-no-value/output.js

var _marked = /*#__PURE__*/babelHelpers.regenerator().m(g);
// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-generator-function-definitions-runtime-semantics-evaluation
es6id: 14.4.14
description: >
  `value` property is not accessed when iteration is incomplete
info: |
  YieldExpression : yield * AssignmentExpression

  1. Let exprRef be the result of evaluating AssignmentExpression.
  2. Let value be ? GetValue(exprRef).
  3. Let iterator be ? GetIterator(value).
  4. Let received be NormalCompletion(undefined).
  5. Repeat
     a. If received.[[Type]] is normal, then
        [...]
     b. Else if received.[[Type]] is throw, then
        [...]
     c. Else,
        i. Assert: received.[[Type]] is return.
        ii. Let return be ? GetMethod(iterator, "return").
        iii. If return is undefined, return Completion(received).
        iv. Let innerReturnResult be ? Call(return, iterator, «
            received.[[Value]] »).
        v. If Type(innerReturnResult) is not Object, throw a TypeError
           exception.
        vi. Let done be ? IteratorComplete(innerReturnResult).
        vii. If done is true, then
             1. Let value be ? IteratorValue(innerReturnResult).
             2. Return Completion{[[Type]]: return, [[Value]]: value,
                [[Target]]: empty}.
        viii. Let received be GeneratorYield(innerReturnResult).

  7.4.3 IteratorComplete

  1. Assert: Type(iterResult) is Object.
  2. Return ToBoolean(? Get(iterResult, "done")).
features: [generators, Symbol.iterator]
---*/

var assert = require("assert");
var badIter = {};
var callCount = 0;
var spyValue = Object.defineProperty({
  done: false
}, 'value', {
  get: function get() {
    callCount += 1;
  }
});
badIter[Symbol.iterator] = function () {
  return {
    next: function next() {
      return {
        done: false
      };
    },
    "return": function _return() {
      return spyValue;
    }
  };
};
var normalCompletion = false;
var errorCompletion = false;
var delegationComplete = false;
function g() {
  var _t;
  return babelHelpers.regenerator().w(function (_context) {
    while (1) switch (_context.p = _context.n) {
      case 0:
        _context.p = 0;
        return _context.d(babelHelpers.regeneratorValues(badIter), 1);
      case 1:
        normalCompletion = true;
        _context.n = 3;
        break;
      case 2:
        _context.p = 2;
        _t = _context.v;
        errorCompletion = true;
      case 3:
        _context.p = 3;
        delegationComplete = true;
        return _context.f(3);
      case 4:
        return _context.a(2);
    }
  }, _marked, null, [[0, 2, 3, 4]]);
}
var iter = g();
iter.next();
assert.strictEqual(callCount, 0, 'access count (first iteration)');
assert.strictEqual(delegationComplete, false, 'delegation ongoing (first iteration)');
iter["return"]();
assert.strictEqual(callCount, 0, 'access count (second iteration)');
assert.strictEqual(delegationComplete, false, 'delegation ongoing (second iteration)');
spyValue.done = true;
iter["return"]();
assert.strictEqual(callCount, 1, 'access count (final iteration)');
assert.strictEqual(delegationComplete, true, 'delegation complete');
assert.strictEqual(normalCompletion, false, 'completion was abrupt');
assert.strictEqual(errorCompletion, false, 'completion was not of type "throw"');