1719ef36c4
There is code in Flutter that verifies the analyzer with language verison `2.7`, and breaks if we remove legacy support. I opened https://github.com/flutter/flutter/issues/141743 Bug: https://github.com/flutter/flutter/issues/141576 Change-Id: I9ec47c2126149ead49cdead82f49fd9eb80a75ac Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/346948 Commit-Queue: Konstantin Shcheglov <scheglov@google.com> Reviewed-by: Samuel Rawlins <srawlins@google.com>