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Closes #43721. Closes #43677. Bug: https://github.com/dart-lang/sdk/issues/43721 Bug: https://github.com/dart-lang/sdk/issues/43677 Change-Id: Iac7840e7699809946830067cd709314c6302986e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/166639 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Dmitry Stefantsov <dmitryas@google.com>