anchor.diff:        case $7:
         case $8:
         case $9:
  -      case $dot:
           return _number();
           break;
   
  
positive.code:         rest: rest, keywordRest: keywordRest);
    }
  
    Expression _expression({bool until(), String untilName}) {
      if (until != null && until()) scanner.error("Expected expression.");
  
      List<Expression> commaExpressions;
  
negative.code:         case $7:
          case $8:
          case $9:
            addSingleExpression(_number());
            break;
  
          case $dot:
            if (scanner.peekChar(1) == $dot) break loop;
            addSingleExpression(_number());
            break;
  
  