555e38db9b
An `enumEntry` needs to allow for the keyword `augment` in order to enable augmentation libraries. This CL performs a grammar rule update in Dart.g and Dart.g4, such that this keyword can be included. The corresponding change to the feature specification was performed in https://github.com/dart-lang/language/pull/3688. Change-Id: I6d6a3f09754a76da668dfc84cd20a7df812ecdbd Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/360642 Reviewed-by: William Hesse <whesse@google.com> Commit-Queue: Erik Ernst <eernst@google.com>