anchor.diff:    }
   
     Expression _expressionUntilComma() =>
  -      _expression(until: () => scanner.peekChar() == $comma, untilName: '","');
  +      _expression(until: () => scanner.peekChar() == $comma);
   
     // non-list expression
     Expression _singleExpression() {
  
positive.code:       case $7:
        case $8:
        case $9:
        case $dot:
          return _number();
          break;
  
  
negative.code:         case $7:
          case $8:
          case $9:
            addSingleExpression(_number());
            break;
  
          case $dot:
            if (scanner.peekChar(1) == $dot) break loop;
            addSingleExpression(_number());
            break;
  
  