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很奇怪,dart的deprecated标志不写在注释里面,而是要用decorator:
@Deprecated('Use [ConflictException]')
class AlreadyExistsException implements Exception {}
https://api.dart.dev/stable/2.8.4/dart-core/Deprecated-class.html
@mashiro 方便 parser 构建 AST 之后做静态分析。这样一个 class deprecated 了，不管是访问 class method/property 还是 instantiate class 都能输出 deprecation warning