anchor.diff:      HintCode.USE_OF_VOID_RESULT,
       HintCode.FILE_IMPORT_INSIDE_LIB_REFERENCES_FILE_OUTSIDE,
       HintCode.FILE_IMPORT_OUTSIDE_LIB_REFERENCES_FILE_INSIDE,
  -    HintCode.NULL_AWARE_IN_CONDITION,
       HintCode.PACKAGE_IMPORT_CONTAINS_DOT_DOT,
       HtmlErrorCode.PARSE_ERROR,
       HtmlWarningCode.INVALID_URI,
  
positive.code:     // error.dart:
      //
      AnalysisOptionsErrorCode.PARSE_ERROR,
      AnalysisOptionsWarningCode.UNSUPPORTED_OPTION_WITH_LEGAL_VALUE,
      AnalysisOptionsWarningCode.UNSUPPORTED_OPTION_WITH_LEGAL_VALUES,
      CheckedModeCompileTimeErrorCode.CONST_CONSTRUCTOR_FIELD_TYPE_MISMATCH,
      CheckedModeCompileTimeErrorCode.CONST_CONSTRUCTOR_PARAM_TYPE_MISMATCH,
      CheckedModeCompileTimeErrorCode.CONST_FIELD_INITIALIZER_NOT_ASSIGNABLE,
  
negative.code:     StaticTypeWarningCode.UNDEFINED_FUNCTION,
      StaticTypeWarningCode.UNDEFINED_GETTER,
      StaticTypeWarningCode.UNDEFINED_METHOD,
      StaticTypeWarningCode.UNDEFINED_METHOD_WITH_CONSTRUCTOR,
      StaticTypeWarningCode.UNDEFINED_OPERATOR,
      StaticTypeWarningCode.UNDEFINED_SETTER,
      StaticTypeWarningCode.UNDEFINED_SUPER_GETTER,
  