cb726901f7
I will add new functionality (binary protocol for macro compilation), and would like to use modern language version. Change-Id: I2fc0dc57b64b41669e76a81dff76b0eac93808e5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/239621 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>