anchor.diff:              buffer.writeCharCode($backslash);
               buffer.writeCharCode($double_quote);
             } else if (includesSingleQuote) {
  -            return _visitString(string, forceDoubleQuote: true);
  +            _visitString(string, forceDoubleQuote: true);
  +            return;
             } else {
               includesDoubleQuote = true;
               buffer.writeCharCode($double_quote);
  
positive.code:       }
      }
  
      var doubleQuote = forceDoubleQuote || !includesDoubleQuote;
      return doubleQuote ? '"$buffer"' : "'$buffer'";
    }
  
    // ## Selectors
  
negative.code:           if (forceDoubleQuote) {
              buffer.writeCharCode($single_quote);
            } else if (includesDoubleQuote) {
              _visitString(string, forceDoubleQuote: true);
              return;
            } else {
              includesSingleQuote = true;
              buffer.writeCharCode($single_quote);
  