cf99e4af47
I plan using this protocol for compiling macros in the analyzer. Change-Id: Ic0187ac053d7a99125fa21ee1f9ae1a858717280 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/241043 Reviewed-by: Johnni Winther <johnniwinther@google.com> Reviewed-by: Jake Macdonald <jakemac@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>