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