6e9556c3de
Added highlighting for the 'mixin' keyword on classes and fixed the BNF to be consistent with the spec. Change-Id: Iaa5b32ba2d122f01d5ddaddc066ac8f4a50b9844 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/279237 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Kallen Tu <kallentu@google.com>