Dart 3 compatibility: turn classes into mixins

dart-lang / html

Dart port of html5lib. For parsing HTML/HTML5 with Dart. Works in the client and on the server.

https://pub.dev/packages/html

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Dart 3 compatibility: turn classes into mixins #208

Closed oprypin closed 1 year ago

oprypin commented 1 year ago

These are private definitions and are only ever used in a with clause. They should just be changed to mixin to become compatible with Dart language 3.0.