In <listserv%201102160900125806.0...@bama.ua.edu>, on 02/16/2011
   at 09:00 AM, Tom Marchant <m42tom-ibmm...@yahoo.com> said:

>The invoked routine can only protect itself.  It can not issue a
>message that includes the context in which it is called. 

What prevents the invoked routing from displaying a traceback? For
PL/I that's been a standard capability for decades.
 
-- 
     Shmuel (Seymour J.) Metz, SysProg and JOAT
     ISO position; see <http://patriot.net/~shmuel/resume/brief.html> 
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)

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