Add @mustBeConst annotation for parameters which should be
constant.
As const-only parameters are not planned, see
https://github.com/dart-lang/language/issues/1684, an annotation with analyzer support could help a bit at least, see
https://github.com/dart-lang/sdk/issues/29381.
The motivation is to enforce const arguments for methods annotated with
`@ResourceIdentifier`, to be able to record the argument values at build time, see https://dart-review.googlesource.com/c/sdk/+/329961.
Tested: pkg/analyzer/test/src/diagnostics/const_argument_test.dart
Change-Id: I2b8d2dce0c899fc0caa4985d892a5d031c747521
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/357701
Reviewed-by: Phil Quitslund <pquitslund@google.com>
Reviewed-by: Lasse Nielsen <lrn@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Moritz Sümmermann <mosum@google.com>
Reviewed-by: Marya Belanger <mbelanger@google.com>
Moritz
b321254093