() Omar Polo <op@omarpolo.com>
() Wed, 09 Dec 2020 10:53:26 +0100

   Why is cl-delete-if not removing items from the list?  (setq
   delp t) evaluates to t, so it should delete.  cl-delete-if a
   destructive function.  This is what I'm not getting.

On my system, ‘C-h f cl-delete-if RET’ sez:

 This is a destructive function; it reuses the storage of SEQ
 whenever possible.

So, your question becomes: When is it NOT possible to reuse the
storage of SEQ in the process of deleting an item?

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