docs: public final DRL5Expressions.shiftExpression_return shiftExpression() throws RecognitionException {
  		DRL5Expressions.shiftExpression_return retval = new DRL5Expressions.shiftExpression_return();
  		retval.start = input.LT(1);
  
  		BaseDescr left =null;
  
  		try {
  			// src/main/resources/org/drools/compiler/lang/DRL5Expressions.g:446:3: (left= additiveExpression ( ( shiftOp )=> shiftOp additiveExpression )* )
  			// src/main/resources/org/drools/compiler/lang/DRL5Expressions.g:446:5: left= additiveExpression ( ( shiftOp )=> shiftOp additiveExpression )*
  			{
  			pushFollow(FOLLOW_additiveExpression_in_shiftExpression2064);
  			left=additiveExpression();
  			state._fsp--;
  			if (state.failed) return retval;
  			if ( state.backtracking==0 ) { if( buildDescr  ) { retval.result = left; } }
  			// src/main/resources/org/drools/compiler/lang/DRL5Expressions.g:447:5: ( ( shiftOp )=> shiftOp additiveExpression )*
  			loop45:
  			while (true) {
  				int alt45=2;
  				int LA45_0 = input.LA(1);
  				if ( (LA45_0==LESS) ) {
  					int LA45_6 = input.LA(2);
  					if ( (synpred12_DRL5Expressions()) ) {
  						alt45=1;
  					}
  
  				}
  				else if ( (LA45_0==GREATER) ) {
  					int LA45_7 = input.LA(2);
  					if ( (synpred12_DRL5Expressions()) ) {
  						alt45=1;
  					}
  
  				}
  
  				switch (alt45) {
  				case 1 :
  					// src/main/resources/org/drools/compiler/lang/DRL5Expressions.g:447:7: ( shiftOp )=> shiftOp additiveExpression
  					{
  					pushFollow(FOLLOW_shiftOp_in_shiftExpression2078);
  					shiftOp();
  					state._fsp--;
  					if (state.failed) return retval;
  					pushFollow(FOLLOW_additiveExpression_in_shiftExpression2080);
  					additiveExpression();
  					state._fsp--;
  					if (state.failed) return retval;
  					}
  					break;
  
  				default :
  					break loop45;
  				}
  			}
  
  			}
  
  			retval.stop = input.LT(-1);
  
  		}
  
  		catch (RecognitionException re) {
  		    throw re;
  		}
  
  		finally {
  			// do for sure before leaving
  		}
  		return retval;
  	}