On Wed, 14 Oct 2020 19:50:04 +0000, Lars Höglund wrote:
>
>Do You the reason why the default for SYSSYM is DISALLOW?
> 
Obsession with compatibility.  It's possible that someone, somewhere, has
a "dusty old deck" containing a string matching the name of a system
symbol which would break with ALLOW.  By making the default DISALLOW,
IBM passes the onus of such a failure to the customer's sysadmin.

This would never have been a problem if JCL made reference to undefined
symbols a syntax error.

-- gil

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