mplist_set -

       Copyright (C) 2001 Information-technology Promotion Agency (IPA)
       Copyright (C) 2001-2011 National Institute of Advanced Industrial Science and Technology (AIST)
       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free
       Documentation License <http://www.gnu.org/licenses/fdl.html>.

Version 1.8.4                                    Mon Sep 25 2023                               mplist_set(3m17n)

       Set the first property in a property list. The mplist_set() function sets the key and the value of the
       first property in property list plist to key and value, respectively. See the documentation of
       mplist_add() for the restriction on key and val.

       mplist_set -

           If the operation was successful, mplist_set() returns plist. Otherwise, it returns NULL.

MPlist* mplist_set (MPlist * plist, MSymbol key, void * val)