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This was difficult to observe in practice, as it required a combination of two unlikely things: - an `async` function with no awaits - a custom Zone with side-effecting scheduleMicrotask callback The new implementation matches dart2js and the Dart VM's behavior. Change-Id: I4ff275f37aa93d23643481f00c33aeacb7138b01 Reviewed-on: https://dart-review.googlesource.com/58980 Commit-Queue: Jenny Messerly <jmesserly@google.com> Reviewed-by: Vijay Menon <vsm@google.com>