GNU bug report logs - #22291
25.1.50; REGRESSION: Emacs 24.3 breaks loading cl-macs to get macro `case'

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#22291: closed (25.1.50; REGRESSION: Emacs 24.3 breaks loading
 cl-macs to get macro `case')
Date: Sat, 02 Jan 2016 17:46:02 +0000

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Your message dated Sat, 02 Jan 2016 19:44:44 +0200
with message-id <837fjrc1v7.fsf <at> gnu.org>
and subject line Re: bug#22291: 25.1.50; REGRESSION: Emacs 24.3 breaks loading cl-macs to get macro `case'
has caused the debbugs.gnu.org bug report #22291,
regarding 25.1.50; REGRESSION: Emacs 24.3 breaks loading cl-macs to get macro `case'
to be marked as done.

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From: Drew Adams <drew.adams <at> oracle.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.1.50; REGRESSION: Emacs 24.3 breaks loading cl-macs to get macro
 `case'
Date: Fri, 1 Jan 2016 19:23:03 -0800 (PST)

This regression was introduced in Emacs 24.3.  Prior to that, code could
use (require 'cl-macs) to have macros such as `case' provided at
runtime.

(eval-when-compile (require 'cl)) still works, of course.  But neither
(eval-when-compile (require 'cl-macs)) nor (require 'cl-macs) defines
macro `case', starting with Emacs 24.3.

This gratuitously breaks any existing code that loads cl-macs expecting
to get the definition of `case'.  This breakage should not be necessary.


In GNU Emacs 25.1.50.1 (i686-pc-mingw32)
 of 2015-12-10
Bzr revision: 6148555ee5a3d0139ae517803718b3e0357933c7
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --prefix=/c/Devel/emacs/snapshot/trunk --enable-checking=yes
 --enable-check-lisp-object-type --without-compress-install 'CFLAGS=-Og
 -ggdb3' LDFLAGS=-Lc:/Devel/emacs/lib 'CPPFLAGS=-DGC_MCHECK=1
 -Ic:/Devel/emacs/include''

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Drew Adams <drew.adams <at> oracle.com>
Cc: 22291-done <at> debbugs.gnu.org
Subject: Re: bug#22291: 25.1.50;
 REGRESSION: Emacs 24.3 breaks loading cl-macs to get macro `case'
Date: Sat, 02 Jan 2016 19:44:44 +0200

> Date: Sat, 2 Jan 2016 09:28:02 -0800 (PST)
> From: Drew Adams <drew.adams <at> oracle.com>
> Cc: 22291 <at> debbugs.gnu.org
> 
> > IOW, this was a deliberate change, and you should either use 'cl-case'
> > with Emacs versions since 24.3, or use 'cl' instead of 'cl-macs'.
> 
> I know all of that.  Just because something was decided does not mean
> that that decision was the best decision possible, or even wise.
> 
> This is a gratuitous change that breaks backward compatibility.  That's
> the point.  Gratuitous - unnecessary.
> 
> Personally I tend to require `cl', and at compile-time only, to get
> such macros.  But it is entirely reasonable that someone might require
> `cl-macs' - at runtime or compile time - to get such a macro definition.
> 
> And if some user does not compile the code that requires the library
> that provides the macro, then s?he will now get the entire `cl' at
> runtime, instead of getting only the much-smaller `cl-macs' at runtime.
> 
> > OK?
> 
> Not IMHO.

So I guess we will have to agree to disagree on this one.

From my POV, this is not a bug, but a deliberate change that is well
documented.

Closing.

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