anchor.diff:  
   fragment
   SingleQuoteStringChar
  -	: ~['\\]
  +	: ~[\r\n'\\]
   	| SingleEscapeSequence
   	;
   
  
positive.code: fragment
  BackquotedChar
  	: '\\' '`'
  	| ~'`'
  	;
  
  Dollar_At
  
negative.code: 
  fragment
  DoubleQuoteStringChar
  	: ~[\r\n`$"\\]
  	| DoubleEscapeSequence
  	;
  
  