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All existing embedders have been opted into --lazy-async-stacks, the VM also uses it as it's default in all configurations. After this CL, any user of --causal-async-stacks will get an error message when trying to use it. => In any such case, please simply remove the flag. TEST=Exhaustive CQ. Bug: https://github.com/dart-lang/sdk/issues/37668 Change-Id: Ia440afcf2dba464aa8b8cf381b93bbac8eb9f8dc Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/172564 Commit-Queue: Clement Skau <cskau@google.com> Reviewed-by: Clement Skau <cskau@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>