JSTests/test262/test/language/expressions/yield/star-rhs-iter-get-call-non-obj.js

// 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: TypeError thrown when @@iterator method returns a non-object value
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).

  7.4.1 GetIterator

  1. If method was not passed, then
     a. Let method be ? GetMethod(obj, @@iterator).
  2. Let iterator be ? Call(method, obj).
  3. If Type(iterator) is not Object, throw a TypeError exception.
features: [generators, Symbol.iterator]
---*/

var badIter = {};
badIter[Symbol.iterator] = function() {
  return 7;
};
function* g() {
  try {
    yield * badIter;
  } catch (err) {
    caught = err;
  }
}
var iter = g();
var result, caught;

result = iter.next();

assert.sameValue(result.value, undefined);
assert.sameValue(result.done, true);
assert.sameValue(typeof caught, 'object');
assert.sameValue(caught.constructor, TypeError);