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3bb6cc265e
* Manual merge or Dart into flutter a3815b6590...24c7666def dart-lang/sdk@24c7666def Update tests that have the current version number hardcoded dart-lang/sdk@f88ce7aef5 Increase Dart version to 2.10 * Update language version. * Update license. * Hpdate language version. * Update license.
48 lines
1.8 KiB
Dart
48 lines
1.8 KiB
Dart
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// TODO(dnfield): Remove unused_import ignores when https://github.com/dart-lang/sdk/issues/35164 is resolved.
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// @dart = 2.10
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part of dart.ui;
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// TODO(dnfield): Update this if/when we default this to on in the tool,
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// see: https://github.com/flutter/flutter/issues/52759
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/// Annotation used by Flutter's Dart compiler to indicate that an
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/// [Object.toString] override should not be replaced with a supercall.
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///
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/// Since `dart:ui` and `package:flutter` override `toString` purely for
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/// debugging purposes, the frontend compiler is instructed to replace all
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/// `toString` bodies with `return super.toString()` during compilation. This
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/// significantly reduces release code size, and would make it impossible to
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/// implement a meaningful override of `toString` for release mode without
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/// disabling the feature and losing the size savings. If a package uses this
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/// feature and has some unavoidable need to keep the `toString` implementation
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/// for a specific class, applying this annotation will direct the compiler
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/// to leave the method body as-is.
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///
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/// For example, in the following class the `toString` method will remain as
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/// `return _buffer.toString();`, even if the `--delete-tostring-package-uri`
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/// option would otherwise apply and replace it with `return super.toString()`.
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///
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/// ```dart
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/// class MyStringBuffer {
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/// StringBuffer _buffer = StringBuffer();
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///
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/// // ...
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///
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/// @keepToString
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/// @override
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/// String toString() {
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/// return _buffer.toString();
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/// }
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/// }
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/// ```
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const _KeepToString keepToString = _KeepToString();
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class _KeepToString {
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const _KeepToString();
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}
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