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Relatved to https://dart-review.googlesource.com/c/sdk/+/259020 The goal is to avoid the need to update NodeListImpl. I'm not 100% sure that we can fully achieve this, there is at least one more place with switch / case. Change-Id: Ic7468a7b9ded817b3315902cefdeaa7428ec6857 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/259100 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>