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A subtle aspect of the for-of iteration protocol concerns abrupt completions that do *not* trigger iterator closing. Although this detail is implicit in the current structure of the specification text, some hosts may violate the protocol by closing the iterator because later steps *do* specify that behavior. The V8 engine is one such host--as of this writing, it incorrectly closes the iterator when accessing the `value` property of the iterator result produces an abrupt completion. Add tests verifying that the iterator protocol is not violated in this way for abrupt completions during the semantics of for-of evaluation.
Test262 is the official ECMAScript (ECMA-262) conformance suite.
Test262 tests conformance to the continually maintained draft future ECMAScript standard found at http://tc39.github.io/ecma262/ , together with any Stage 3 or later TC39 proposals. It is maintained by Tom Care (@tcare) with significant contributions from many in the ECMAScript community.
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