profiling variable on 6.0.0-alpha

[Carlos Troncoso]

I havn't been able to use the profliling as explained in http://dev.mysql.com/tech-resources/articles/using-new-query-profiler.html.

As stated:
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Getting started with the SQL Profiler

The SQL Profiler is built into the database server and can be dynamically enabled/disabled via the MySQL client utility. To begin profiling one or more SQL queries, simply issue the following command:

mysql> set profiling=1;
Query OK, 0 rows affected (0.00 sec)
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This is my output.

cosole output:
mysql> set profiling=1;
ERROR 1193 (HY000): Unknown system variable 'profiling'

So, has this valuable option been dropped?
Is it now a pluggin / option or whatever?

THX