Dart now has a "covariant" keyword that serves the same purpose.
Fixes#28797
Note that this is a breaking change, not to the analyzer API but to
the language semantics implemented by the analyzer; client code that
wants the "@checked" behavior will now have to use the "covariant"
keyword instead. Since the front end implementation of the type
system only supports the "covariant" keyword, the impact on user code
should be low; any user code that would be broken by this change is
already broken under the front end. Google internal code has already
been migrated to use "covariant".
Change-Id: Ida052bd5449d3ba703bacf98143bece650f53b53
Reviewed-on: https://dart-review.googlesource.com/c/88225
Commit-Queue: Paul Berry <paulberry@google.com>
Auto-Submit: Paul Berry <paulberry@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Paul Berry
01a8ff067e