a5c961d50b
Rationale: Allow multiple classes to inherit from the same parent and to call arbitrary methods of the direct parent. Change-Id: I2db20811c252b1f9008154632f16b625333f4b56 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/114050 Reviewed-by: Aart Bik <ajcbik@google.com> Commit-Queue: Felicitas Hetzelt <felih@google.com>