On 2013-08-15, at 22:24, Ted MacNEIL wrote:

> You can call CLIST from CLIST with %clist.
> Or EXEC from, etc.
> Just with REXX it must be: "%EXEC" (or, "%CLIST").
>  
Which has nothing to do with nesting, CLIST, or TSO; it's simply
Rexx syntax rules, even as:

    say  %EXEC   /* Is a syntax error.  */
    say "%EXEC"  /* Is permissible.     */
    say '%EXEC'  /* Is permissible.     */

-- gil

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