Keyword collision while trying to send async requests inside async call #37063

ghost · 2019-05-23T07:52:48Z

import 'dart:html' as html;

void main() async {
  var request = new html.HttpRequest();
  request.open('POST', 'http://example.com', async: true);
}

Displays:

Dart VM version: 2.3.0

lrhn · 2019-05-23T08:08:00Z

That is a bug.
The specification says:

It is a compile-time error if either of the identifiers \AWAIT{} or \YIELD{} is used as an identifier in a function body marked with either \ASYNC{}, \code{\ASYNC*} or \code{\SYNC*}.

That makes await and yield context-dependent keywords. They are keywords, but only inside async, async* or sync* methods. That choice was made because we needed the keywords, but did not want to break existing code that already uses the words.
The section used to also make async reserved, but that was changed for Dart 2.0 (it wasn't necessary).

Seems like the our tools haven't removed async them from the reserved list yet.

lrhn self-assigned this May 23, 2019

dart-bot closed this as completed in eca6c89 May 24, 2019

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Keyword collision while trying to send async requests inside async call #37063

Keyword collision while trying to send async requests inside async call #37063

ghost commented May 23, 2019

lrhn commented May 23, 2019 •

edited

Keyword collision while trying to send async requests inside async call #37063

Keyword collision while trying to send async requests inside async call #37063

Comments

ghost commented May 23, 2019

lrhn commented May 23, 2019 • edited

lrhn commented May 23, 2019 •

edited