Konstantin Shcheglov
cbab413950
We need this to support the following requirement in the mixin specification: It's a compile-time error to apply a mixin containing super-invocations to a class that doesn't have a concrete implementation of the super-invoked members. R=brianwilkerson@google.com, paulberry@google.com Change-Id: Ib683794fe7101222863b34956619773e2af52d1a Reviewed-on: https://dart-review.googlesource.com/73780 Reviewed-by: Paul Berry <paulberry@google.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>