anchor.diff:      CompileTimeErrorCode.EXTENDS_NON_CLASS,
       CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS,
       CompileTimeErrorCode.EXTENDS_DEFERRED_CLASS,
  +    CompileTimeErrorCode.EXTRA_ARGUMENT_TO_ASSERT,
       CompileTimeErrorCode.EXTRA_POSITIONAL_ARGUMENTS,
       CompileTimeErrorCode.FIELD_INITIALIZED_BY_MULTIPLE_INITIALIZERS,
       CompileTimeErrorCode.FIELD_INITIALIZED_IN_PARAMETER_AND_INITIALIZER,
  
positive.code:     ParserErrorCode.ASSERT_DOES_NOT_TAKE_THROW,
      ParserErrorCode.ASSERT_DOES_NOT_TAKE_RETHROW,
      ParserErrorCode.ASYNC_KEYWORD_USED_AS_IDENTIFIER,
      ParserErrorCode.BREAK_OUTSIDE_OF_LOOP,
      ParserErrorCode.CLASS_IN_CLASS,
      ParserErrorCode.COLON_IN_PLACE_OF_IN,
  
negative.code:     CompileTimeErrorCode.YIELD_EACH_IN_NON_GENERATOR,
      CompileTimeErrorCode.YIELD_IN_NON_GENERATOR,
      HintCode.ARGUMENT_TYPE_NOT_ASSIGNABLE,
      HintCode.CAN_BE_NULL_AFTER_NULL_AWARE,
      HintCode.DEAD_CODE,
      HintCode.DEAD_CODE_CATCH_FOLLOWING_CATCH,
      HintCode.DEAD_CODE_ON_CATCH_SUBTYPE,
  