anchor.diff:  
   MULTI_COMMENT
       :   '/*'
  -        (    ~('/'|'*'|EOF)
  +        (    ~('/'|'*')
           |    ('/' ~'*') => '/'
           |    ('*' ~'/') => '*'
           |    MULTI_COMMENT
  
positive.code:     ;
  
  LINE_COMMENT
      :   ('//'|'#!') ~('\n'|'\r'|EOF)*  ('\r\n' | '\r' | '\n')?
          {
              $channel = HIDDEN;
          }
  
negative.code: */
  fragment
  CharPart
      : ( ~('\\' | '\'') | EscapeSequence )*
      ;
      
  /*
  