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It might have caused a memory leak. It is hard to say - there ware some references from Closure, from other Closure, and eventually from the _completer. R=brianwilkerson@google.com Change-Id: I18c75f48e74e9ae04265170751224261f51ccf76 Reviewed-on: https://dart-review.googlesource.com/c/78322 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>