code: public final void postAggArithOper(PostAggItem postAggItem) throws RecognitionException {
  		Token arith=null;
  
  		try {
  			// druidG.g:554:2: (arith= ARITH_OPER )
  			// druidG.g:554:3: arith= ARITH_OPER
  			{
  			arith=(Token)match(input,ARITH_OPER,FOLLOW_ARITH_OPER_in_postAggArithOper3606); 
  			postAggItem.fn = (arith!=null?arith.getText():null);
  			}
  
  		}
  		catch (RecognitionException re) {
  			reportError(re);
  			recover(input,re);
  		}
  		finally {
  			// do for sure before leaving
  		}
  	}
docs: druidG.g:553:1: postAggArithOper[PostAggItem postAggItem] : arith= ARITH_OPER ;