anchor.diff:      ;
   
   QUOTED_LITERAL
  -    :   '\'' QuotedLiteralPart '\''
  +    :   '\'' QuotedLiteralPart '\''?
       ;
   
   fragment
  
positive.code:         |    ('*' ~'/') => '*'
          |    MULTI_COMMENT
          )*
          '*/'
          {
              $channel = HIDDEN;
          }
  
negative.code:     ;
  
  STRING_LITERAL
      :   '"' StringPart '"'?
      ;
  
  fragment
  