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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: `eval-when-compile' and circular dependencies (was: Re: Source
	file '.../killer-source.el' newer than byte-compiled file)
Date: Thu, 25 Apr 2019 11:43:29 +0300
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> From: Emanuel Berg <moasenwood@zoho.eu>
> Date: Thu, 25 Apr 2019 09:03:05 +0200
> 
> Eli Zaretskii wrote:
> 
> > You could look at Eshell as one example, if
> > you really want to understand. The solution
> > involves using eval-when-compile and its ilk,
> > I think.
> 
> OK, but this isn't the only use case for
> `eval-when-compile', right?

No, of course not.  Its use cases are described in the ELisp manual.