Not possible to capture rowcounts when using Composable DML

/******************************************************************************************************************************
A demonstration of capturing rowcounts when using composable DML. The problem I'm trying to demonstrate here is that
I don't think there is a way to capture the number of rows affected by the MERGE

Jamie Thomson, 2013-02-07
******************************************************************************************************************************/

/*Setup table first and insert some data into [src]*/
USE tempdb
IF OBJECT_ID('src') IS NOT NULL     DROP TABLE src;
CREATE TABLE src (
    id      INT
,   name    NVARCHAR(MAX)
);
IF OBJECT_ID('tgt') IS NOT NULL     DROP TABLE tgt;
CREATE TABLE tgt (
    id      INT
,   name    NVARCHAR(MAX)
);
/*[updates] will be used as the target of the Composable DML insertion*/
IF OBJECT_ID('old_values') IS NOT NULL      DROP TABLE old_values;
CREATE TABLE old_values (
    id      INT
,   name    NVARCHAR(MAX)
);
INSERT src(id,name)VALUES(1,'don'),(2,'kaina');
GO

/*Everything after here gets run twice because the batch ends with GO 2*/
INSERT old_values( id, name )
SELECT  mrgout.deleted_id
,       mrgout.deleted_name
FROM    (
        MERGE   tgt
        USING   src
            ON  tgt.id = src.id
        WHEN MATCHED THEN
            UPDATE
            SET tgt.NAME = src.NAME
          WHEN NOT MATCHED THEN
            INSERT(id,name)
            VALUES(src.id,src.name)
        OUTPUT $ACTION AS action_
        ,       INSERTED.id AS inserted_id
        ,       INSERTED.NAME AS inserted_name
        ,       DELETED.id AS deleted_id
        ,       DELETED.name AS deleted_name
        )mrgout
WHERE   mrgout.action_ = 'UPDATE' --Filtering on $action=UPDATE allows us to get the replaced values from DELETED virtual table
;
SELECT  [@@ROWCOUNT]=@@ROWCOUNT,row_tally_in_tgt=(SELECT COUNT(*) FROM tgt)  -- <-Rowcount only provides tally of rows affected by the outer INSERT, not the MERGE
GO 2