[meta] Remove @experimental annotation from @redeclare.

This annotation has been supported for some time, and is a valuable
piece of the "extension types" feature.

Change-Id: I6a6a6964f02564ff673cbdd6fca6b8bc69e5a06a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/451160
Reviewed-by: Konstantin Shcheglov <[email protected]>
Commit-Queue: Paul Berry <[email protected]>
Reviewed-by: Brian Wilkerson <[email protected]>

Author: stereotype441

pkg/analyzer/lib/src/test_utilities/mock_packages.dart

@@ -125,7 +125,6 @@ const _OptionalTypeArgs optionalTypeArgs = _OptionalTypeArgs();
 
 const _Protected protected = _Protected();
 
-@experimental
 const _Redeclare redeclare = _Redeclare();
 
 const _Reopen reopen = _Reopen();

pkg/analyzer_testing/lib/mock_packages/package_content/meta/lib/meta.dart

@@ -434,7 +434,6 @@ const _Protected protected = _Protected();
 ///   member of an extension type (a method, operator, getter, or setter) or
 /// * is applied to a member that does not redeclare a member from either the
 ///   extended type or a superinterface.
-@experimental
 const _Redeclare redeclare = _Redeclare();
 
 /// Annotation for intentionally loosening restrictions on subtyping that would

pkg/meta/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.18.0-dev
+
+- The `@redeclare` annotation is no longer considered experimental.
+
 ## 1.17.0
 
 - Introduce `@awaitNotRequired` to annotate `Future`-returning functions and

pkg/meta/lib/meta.dart

@@ -436,7 +436,6 @@ const _Protected protected = _Protected();
 ///   member of an extension type (a method, operator, getter, or setter) or
 /// * is applied to a member that does not redeclare a member from either the
 ///   extended type or a superinterface.
-@experimental
 const _Redeclare redeclare = _Redeclare();
 
 /// Annotation for intentionally loosening restrictions on subtyping that would

pkg/meta/pubspec.yaml

@@ -1,7 +1,7 @@
 name: meta
 # Note, because version `2.0.0` was mistakenly released,
 # the next major version must be `3.x.y`.
-version: 1.17.0
+version: 1.18.0-dev
 description: >-
  Annotations used to express developer intentions that can't otherwise be
  deduced by statically analyzing source code.