3688a4723c
When given a completed `_Future`, it would complete its own future synchronously. Fixes #48493. Bug: https://github.com/dart-lang/sdk/issues/48493 Change-Id: Ic4a68389b5a009ef52b3875bf03a3bafb493f79a Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/234981 Reviewed-by: Nate Bosch <nbosch@google.com> Commit-Queue: Lasse Nielsen <lrn@google.com>