anchor.diff:     */
     static const CompileTimeErrorCode GENERIC_FUNCTION_TYPE_CANNOT_BE_BOUND =
         const CompileTimeErrorCode('GENERIC_FUNCTION_TYPE_CANNOT_BE_BOUND',
  -          'Generic function types may not be used as type parameter bounds',
  -          correction: 'Try making the free variable in the function type part'
  -              ' of the larger declaration signature');
  +          "Generic function types may not be used as type parameter bounds",
  +          correction: "Try making the free variable in the function type part"
  +              " of the larger declaration signature");
   
     static const CompileTimeErrorCode FOR_IN_WITH_CONST_VARIABLE =
         const CompileTimeErrorCode('FOR_IN_WITH_CONST_VARIABLE',
  
positive.code:           'DEFAULT_LIST_CONSTRUCTOR_MISMATCH',
            "A list whose values cannot be 'null' cannot be given an initial length "
                "because the initial values would all be 'null'.",
            correction: "Try removing the argument.");
  
    /**
     * 6.2.1 Required Formals: By means of a function signature that names the
  
negative.code:       'USE_OF_VOID_RESULT',
        "The expression here has a type of 'void', and therefore cannot be used.",
        correction:
            "Check if you are using the correct API; there may be a function or"
            " call that returns void you didn't expect. Also check type parameters"
            " and variables which, in rare cases, may be void as well.");
  
    @override
    final ErrorSeverity errorSeverity;
  