anchor.diff:  
   fragment
   EOL
  -    : '\n'| '\r'
  +    : '\n' | '\r'
       ;
   
   REFERENCE
  
positive.code: 
  fragment
  ECHAR
      : '\\' ('t' | 'b' | 'n' | 'r' | 'f' | '"' | '\'')
      ;
  
  fragment
  
negative.code:     : MINUS DOUBLE
      ;
  
  fragment
  EXPONENT
      : ('e'|'E') (PLUS|MINUS)? DIGIT+
      ;
  