106d6b0ca5
This happened using APIs like `Stream.first` that set cancelOnError when they called `Stream.listen()`. If an error is signaled, Stream internals will call `cancel()` and wait for that future to complete before sending the error to the resulting Future. However the `async*` implementation class did not properly account for that possiblity, and never completed the cancellation future in that case. Change-Id: Ieaa35e56ee80208d7946904ea40bfd5f785ef9d6 Reviewed-on: https://dart-review.googlesource.com/c/83467 Commit-Queue: Alan Knight <alanknight@google.com> Auto-Submit: Jenny Messerly <jmesserly@google.com> Reviewed-by: Alan Knight <alanknight@google.com>