485c1962d3
From the spec: > A compile-time error occurs if a constructor tear-off denotes a > generative constructor declared in an abstract class. Change-Id: Ic1bf3fd5a726f327a0dd80d180b7b88790514797 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/210660 Commit-Queue: Samuel Rawlins <srawlins@google.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com>