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TEST=Adding new node id. Conflicts should be detected by existing tests. Change-Id: I49791188345b6b8cfc7cad2fef9983d499d326ef Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/202764 Commit-Queue: Dmitry Stefantsov <dmitryas@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com>