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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Imports / inclusion of s.el into Emacs
Date: Sat, 02 May 2020 10:02:25 +0300
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> From: Richard Stallman <rms@gnu.org>
> Date: Fri, 01 May 2020 22:23:44 -0400
> Cc: emacs-devel@gnu.org
> 
> Renaming 'concat' seems also like spurious inconvenience in the name
> of rigidity -- the Lisp equivalent of bureaucratese.

We all do keep in mind that 'concat' is about much more than strings,
yes?  Such polymorphic APIs are IMO a problem when a simplistic
re/naming is considered.

> What does 's-prepend' do?

  (defun s-prepend (prefix s)
  "Concatenate PREFIX and S."

> And how would we do it in Emacs Lisp now?

Trivially, use 'concat'.