code: public final QueryParser.t_return t() throws RecognitionException {
          QueryParser.t_return retval = new QueryParser.t_return();
          retval.start = input.LT(1);
  
          CommonTree root_0 = null;
  
          Token string_literal84=null;
  
          CommonTree string_literal84_tree=null;
  
          try {
              // src/riemann/Query.g:71:3: ( 'true' )
              // src/riemann/Query.g:71:5: 'true'
              {
              root_0 = (CommonTree)adaptor.nil();
  
              string_literal84=(Token)match(input,27,FOLLOW_27_in_t552); 
              string_literal84_tree = (CommonTree)adaptor.create(string_literal84);
              adaptor.addChild(root_0, string_literal84_tree);
  
  
              }
  
              retval.stop = input.LT(-1);
  
              retval.tree = (CommonTree)adaptor.rulePostProcessing(root_0);
              adaptor.setTokenBoundaries(retval.tree, retval.start, retval.stop);
  
          }
          catch (RecognitionException re) {
              reportError(re);
              recover(input,re);
      	retval.tree = (CommonTree)adaptor.errorNode(input, retval.start, input.LT(-1), re);
  
          }
          finally {
          }
          return retval;
      }
docs: src/riemann/Query.g:71:1: t : 'true' ;