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Re: About cl-lib and `eval-when-compile'

From: Stefan Monnier
Subject: Re: About cl-lib and `eval-when-compile'
Date: Thu, 21 Feb 2013 21:33:37 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

> Since the old `cl.el' does not use a clean namespace, Emacs has a
> policy that packages distributed with Emacs must not load `cl' at run
> time.  If I use the new cl-lib library, do I have to use
> `eval-when-compile'?  Can anybody help?  Thanks.

There's a misunderstanding: there was never any particular need to use
`eval-when-compile' with CL.  What there was is that CL was tolerated
only if used at compile-time (i.e. you could use its macros, but not
its functions).
There's no such problem with `cl-lib', so you can require `cl-lib' both
within or without `eval-when-compile'.  If you only use `cl-lib' macros,
then it's much better to wrap it in `eval-when-compile' so that cl-lib
won't unnecessarily be loaded when you use the package.


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