This adds direct support for class member augmentation, including checks
that the 'augment' modifier is used correctly. Different from the patch
member support, non-augment members added in augment classes are now
part of the interface of the class and can therefore be used outside
the augmentation library.
The CL includes support for using the 'import augment' syntax to import
libraries as augmentation libraries. The enable direct testing of the
augmentation features in expectation tests.
Change-Id: I9961e15862dba827050bec4aceb7dfc45e053d7d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/234520
Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>
Johnni Winther
345dfd34ac