anchor.diff:    const _WhitespaceCharMatcher();
   
     @override
  -  bool call(int value) {
  +  bool match(int value) {
       if (value < 256) {
         return value == 0x09 || value == 0x0A || value == 0x0B || value == 0x0C
             || value == 0x0D || value == 0x20 || value == 0x85 || value == 0xA0;
  
positive.code:   const _LowercaseCharMatcher();
  
    @override
    bool call(int value) => 97 <= value && value <= 122;
  
  }
  
  
negative.code:   const _WordCharMatcher();
  
    @override
    bool match(int value) => (65 <= value && value <= 90) || (97 <= value && value <= 122)
        || (48 <= value && value <= 57) || (value == 95);
  
  }
  