42238ecfb8
This is a reland of 8a57112091
Original change's description:
> Add some operator based tests.
>
> Change-Id: Id9aa12854621eab68227b64bebf507f25b07ea1e
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/154683
> Commit-Queue: Lasse R.H. Nielsen <lrn@google.com>
> Reviewed-by: Johnni Winther <johnniwinther@google.com>
Change-Id: I69f9810d7539b309ee7c1b87c13cd4153c590f2a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/205263
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Commit-Queue: Lasse R.H. Nielsen <lrn@google.com>