2.1.2 [ECMA-262/7] Section 7.4.6 IteratorClose ( iterator, completion )

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V0187: IteratorClose is not correctly implemented

The specification states:

 7.4.6 IteratorClose( iterator..., completion )
  
     The abstract operation IteratorClose with arguments iteratorRecord ["iterator" in 
     specs prior to 2018] and completion is used to notify an iterator that it should 
     perform any actions it would normally perform when it has reached its completed state:
  
         ... Assert: Type... is Object.
         ... Assert: completion is a Completion Record.
         ... ...
         ... Let return be ? GetMethod(iterator, "return").
         ... If return is undefined, return Completion(completion).
         ... Let innerResult be Call(return, iterator, «‍ »).
         ... If completion.[[type]] is throw, return Completion(completion).
         ... If innerResult.[[type]] is throw, return Completion(innerResult).
         ... If Type(innerResult.[[value]]) is not Object, throw a TypeError exception.
         ... Return Completion(completion).

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IteratorClose is not correctly implemented. It behaves as follows:

    7.4.6 IteratorClose( iteratorRecord, completion )

        1.  Assert: Type... is Object.

        2.  Assert: completion is a Completion Record.

        3.  Return Completion(completion).