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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: understanding backquote
Date: Tue, 02 Jun 2015 21:14:29 -0400
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> Still sad, that it is not possible to do it at read or compile time.

If you want to compute it at compile-time, use `eval-when-compile'.  E.g.

   (defun foo (bar)
     (eval-when-compile
       (let ((x "toto"))
         (concat x "titi" x))))


-- Stefan