public final TLParser.addExpr_return addExpr() throws RecognitionException {
        TLParser.addExpr_return retval = new TLParser.addExpr_return();
        retval.start = input.LT(1);

        Object root_0 = null;

        Token set121=null;
        TLParser.mulExpr_return mulExpr120 = null;

        TLParser.mulExpr_return mulExpr122 = null;


        Object set121_tree=null;

        try {
            // src/grammar/TL.g:159:3: ( mulExpr ( ( '+' | '-' ) mulExpr )* )
            // src/grammar/TL.g:159:6: mulExpr ( ( '+' | '-' ) mulExpr )*
            {
            root_0 = (Object)adaptor.nil();

            pushFollow(FOLLOW_mulExpr_in_addExpr1128);
            mulExpr120=mulExpr();

            state._fsp--;

            adaptor.addChild(root_0, mulExpr120.getTree());
            // src/grammar/TL.g:159:14: ( ( '+' | '-' ) mulExpr )*
            loop23:
            do {
                int alt23=2;
                int LA23_0 = input.LA(1);

                if ( ((LA23_0>=Add && LA23_0<=Subtract)) ) {
                    alt23=1;
                }


                switch (alt23) {
            	case 1 :
            	    // src/grammar/TL.g:159:15: ( '+' | '-' ) mulExpr
            	    {
            	    set121=(Token)input.LT(1);
            	    set121=(Token)input.LT(1);
            	    if ( (input.LA(1)>=Add && input.LA(1)<=Subtract) ) {
            	        input.consume();
            	        root_0 = (Object)adaptor.becomeRoot((Object)adaptor.create(set121), root_0);
            	        state.errorRecovery=false;
            	    }
            	    else {
            	        MismatchedSetException mse = new MismatchedSetException(null,input);
            	        throw mse;
            	    }

            	    pushFollow(FOLLOW_mulExpr_in_addExpr1140);
            	    mulExpr122=mulExpr();

            	    state._fsp--;

            	    adaptor.addChild(root_0, mulExpr122.getTree());

            	    }
            	    break;

            	default :
            	    break loop23;
                }
            } while (true);


            }

            retval.stop = input.LT(-1);

            retval.tree = (Object)adaptor.rulePostProcessing(root_0);
            adaptor.setTokenBoundaries(retval.tree, retval.start, retval.stop);

        }
        catch (RecognitionException re) {
            reportError(re);
            recover(input,re);
    	retval.tree = (Object)adaptor.errorNode(input, retval.start, input.LT(-1), re);

        }
        finally {
        }
        return retval;
    }