Because EXEC does not invoke a load module. 

????????"

On Wed, 3 Jun 2020 09:21:46 -0500 Paul Gilmartin
<[email protected]> wrote:

:>On Tue, 2 Jun 2020 23:44:50 -0400, Steve Smith wrote:
:>
:>>I'm not sure this is relevant, but today I ran into this:
:>>
:>>EX 'yadda.zadda.exec(blah)' ',,foo'  /* works */
:>>
:>>but
:>>
:>>%blah ,,foo /* does not work */
:>>
:>>"blah" starts with
:>>
:>>parse arg a ',' b ',' c
:>>
:>>The leading commas disappear with the so-called indirect invocation, ...
:>>
:>The deficiency of EXec is that it does not use the standard load module
:>search sequence for the member name.  Someone should submit an RFE
:>for support of
:>    EXec *(blah)
:>to use the standard exec search sequence for the member name similar
:>to what was doe for CALL within my memory:
:>
:>https://www.ibm.com/support/knowledgecenter/SSLTBW_2.1.0/com.ibm.zos.v2r1.ikjc500/ikj2l2_CALL_command_operands.htm
:>
:>CALL command operands
:>z/OS TSO/E Command Reference
:>SA32-0975-00 
:>
:>dsname
:>    specifies the name of a PDS or a PDSE from which the program 
:>    is to be executed. If dsname is not fully qualified, it is 
:>    assumed to be 'prefix.dsname.LOAD'.
:>*
:>    specifies that CALL should use the standard load module search 
:>    sequence for the member name.
:>
:>-- gil
:>
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