Closes https://github.com/dart-lang/sdk/pull/51143 GitOrigin-RevId: 9e21c99a222d588e4fc95980725a2f8c9784965c Change-Id: If0870e8936c7649935dce7e23cd783d62aa5610c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/279916 Reviewed-by: Alexander Thomas <athom@google.com> Commit-Queue: Alexander Thomas <athom@google.com>
the front-end. I added a couple examples from recent conversations as a starting point. BUG= R=danrubel@google.com, paulberry@google.com, scheglov@google.com Review-Url: https://codereview.chromium.org/2998743002 .