docs: public final BaseDescr additiveExpression() throws RecognitionException {
  		BaseDescr result = null;
  
  
  		BaseDescr left =null;
  
  		try {
  			// src/main/resources/org/drools/compiler/lang/DRL5Expressions.g:457:5: (left= multiplicativeExpression ( ( PLUS | MINUS )=> ( PLUS | MINUS ) multiplicativeExpression )* )
  			// src/main/resources/org/drools/compiler/lang/DRL5Expressions.g:457:9: left= multiplicativeExpression ( ( PLUS | MINUS )=> ( PLUS | MINUS ) multiplicativeExpression )*
  			{
  			pushFollow(FOLLOW_multiplicativeExpression_in_additiveExpression2160);
  			left=multiplicativeExpression();
  			state._fsp--;
  			if (state.failed) return result;
  			if ( state.backtracking==0 ) { if( buildDescr  ) { result = left; } }
  			// src/main/resources/org/drools/compiler/lang/DRL5Expressions.g:458:9: ( ( PLUS | MINUS )=> ( PLUS | MINUS ) multiplicativeExpression )*
  			loop47:
  			while (true) {
  				int alt47=2;
  				int LA47_0 = input.LA(1);
  				if ( (LA47_0==MINUS||LA47_0==PLUS) && (synpred13_DRL5Expressions())) {
  					alt47=1;
  				}
  
  				switch (alt47) {
  				case 1 :
  					// src/main/resources/org/drools/compiler/lang/DRL5Expressions.g:458:11: ( PLUS | MINUS )=> ( PLUS | MINUS ) multiplicativeExpression
  					{
  					if ( input.LA(1)==MINUS||input.LA(1)==PLUS ) {
  						input.consume();
  						state.errorRecovery=false;
  						state.failed=false;
  					}
  					else {
  						if (state.backtracking>0) {state.failed=true; return result;}
  						MismatchedSetException mse = new MismatchedSetException(null,input);
  						throw mse;
  					}
  					pushFollow(FOLLOW_multiplicativeExpression_in_additiveExpression2189);
  					multiplicativeExpression();
  					state._fsp--;
  					if (state.failed) return result;
  					}
  					break;
  
  				default :
  					break loop47;
  				}
  			}
  
  			}
  
  		}
  
  		catch (RecognitionException re) {
  		    throw re;
  		}
  
  		finally {
  			// do for sure before leaving
  		}
  		return result;
  	}