Re: [whatwg/streams] add @@asyncIterator to ReadableStream (#954)

MattiasBuelens commented on this pull request.



> +
+<emu-alg>
+  1. If ! IsReadableStreamAsyncIterator(*this*) is *false*, return <a>a promise rejected with</a> *TypeError* exception.
+  1. Let _reader_ be *this*.[[asyncIteratorReader]].
+  1. If _reader_.[[ownerReadableStream]] is *undefined*, return <a>a promise rejected with</a> a *TypeError* exception.
+  1. Return ! ReadableStreamDefaultReaderRead(_reader_, *true*).
+</emu-alg>
+
+<h4 id="rs-asynciterator-prototype-return" method
+for="ReadableStreamAsyncIteratorPrototype">return( <var>value</var> )</h4>
+
+<emu-alg>
+  1. If ! IsReadableStreamAsyncIterator(*this*) is *false*, return <a>a promise rejected with</a> *TypeError* exception.
+  1. Let _reader_ be *this*.[[asyncIteratorReader]].
+  1. If *this*.[[preventCancel]] is *false*, then:
+    1. If _reader_.[[ownerReadableStream]] is *undefined*, return <a>a promise rejected with</a> a *TypeError*

This should also be changed in the reference implementation.

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