docs: public final QueryParser.equal_return equal() throws RecognitionException {
          QueryParser.equal_return retval = new QueryParser.equal_return();
          retval.start = input.LT(1);
  
          CommonTree root_0 = null;
  
          Token WS71=null;
          Token EQUAL72=null;
          Token WS73=null;
          QueryParser.field_return field70 = null;
  
          QueryParser.value_return value74 = null;
  
  
          CommonTree WS71_tree=null;
          CommonTree EQUAL72_tree=null;
          CommonTree WS73_tree=null;
  
          try {
              // src/riemann/Query.g:65:7: ( field ( WS )* EQUAL ( WS )* value )
              // src/riemann/Query.g:65:9: field ( WS )* EQUAL ( WS )* value
              {
              root_0 = (CommonTree)adaptor.nil();
  
              pushFollow(FOLLOW_field_in_equal488);
              field70=field();
  
              state._fsp--;
  
              adaptor.addChild(root_0, field70.getTree());
              // src/riemann/Query.g:65:15: ( WS )*
              loop27:
              do {
                  int alt27=2;
                  int LA27_0 = input.LA(1);
  
                  if ( (LA27_0==WS) ) {
                      alt27=1;
                  }
  
  
                  switch (alt27) {
              	case 1 :
              	    // src/riemann/Query.g:65:15: WS
              	    {
              	    WS71=(Token)match(input,WS,FOLLOW_WS_in_equal490); 
              	    WS71_tree = (CommonTree)adaptor.create(WS71);
              	    adaptor.addChild(root_0, WS71_tree);
  
  
              	    }
              	    break;
  
              	default :
              	    break loop27;
                  }
              } while (true);
  
              EQUAL72=(Token)match(input,EQUAL,FOLLOW_EQUAL_in_equal493); 
              EQUAL72_tree = (CommonTree)adaptor.create(EQUAL72);
              root_0 = (CommonTree)adaptor.becomeRoot(EQUAL72_tree, root_0);
  
              // src/riemann/Query.g:65:26: ( WS )*
              loop28:
              do {
                  int alt28=2;
                  int LA28_0 = input.LA(1);
  
                  if ( (LA28_0==WS) ) {
                      alt28=1;
                  }
  
  
                  switch (alt28) {
              	case 1 :
              	    // src/riemann/Query.g:65:26: WS
              	    {
              	    WS73=(Token)match(input,WS,FOLLOW_WS_in_equal496); 
              	    WS73_tree = (CommonTree)adaptor.create(WS73);
              	    adaptor.addChild(root_0, WS73_tree);
  
  
              	    }
              	    break;
  
              	default :
              	    break loop28;
                  }
              } while (true);
  
              pushFollow(FOLLOW_value_in_equal499);
              value74=value();
  
              state._fsp--;
  
              adaptor.addChild(root_0, value74.getTree());
  
              }
  
              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;
      }