Re: [heycam/webidl] Add async_iterable support (#720)

Ms2ger commented on this pull request.



> +An [=interface=] must not have more than one [=asynchronously iterable declaration=].
+The [=inherited interfaces=] of an [=interface=] with an [=asynchronously iterable declaration=]
+must not also have an [=asynchronously iterable declaration=].
+An [=interface=] with an [=asynchronously iterable declaration=] and its [=inherited interfaces=]
+must not have a [=maplike declaration=], [=setlike declaration=], or [=iterable declaration=].
+
+The following extended attributes are applicable to [=asynchronously iterable declarations=]:
+[{{Exposed}}],
+[{{SecureContext}}].
+
+Issue: these [=extended attributes=] are not currently taken into account.
+When they are, the effect will be as you would expect.
+
+<pre class="grammar" id="prod-AsyncIterable">
+    AsyncIterable :
+        "async_iterable" "&lt;" TypeWithExtendedAttributes "," TypeWithExtendedAttributes "&gt;" ";"

Added the side effects, but I'd like to defer full Streams support to a followup.

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