From: "Pascal J. Bourguignon" <pjb@informatimago.com>
To: emacs-devel@gnu.org
Subject: Re: problems with flet on last emacs
Date: Wed, 27 Jun 2012 16:42:47 +0200 [thread overview]
Message-ID: <87sjdgq0ig.fsf@kuiper.lan.informatimago.com> (raw)
In-Reply-To: 87ehp099bb.fsf@thinkpad.tsdh.de
Tassilo Horn <tassilo@member.fsf.org> writes:
> Thierry Volpiatto <thierry.volpiatto@gmail.com> writes:
>
>> All functions that use flet don't work anymore.
>> The anonymous function defined by the flet is not read.
>> (i.e void function foo)
>
> Oh, yes, that occured to me too.
>
>> I could make it working by restarting my computer, recompiling
>> some libraries, (helm, slime) and it worked.
>
> Not for me. I've tried to rebuild every elisp package, but the error
> persists.
>
>> When I recompile files, restart Emacs, the problem occur again.
>> I have not this problem on 24.1.
>
> Ditto, currently I'm running the released version without problems.
>
>> Any ideas?
>> If not I will send a bug report.
>
> Please do so. Here's a recipe:
>
> 1. emacs -Q
> 2. goto *scratch*
> 3. eval
>
> (require 'cl)
> (flet ((foo () 1))
> (foo))
>
>
> Debugger entered--Lisp error: (void-function foo)
> symbol-function(foo)
> (let* ((x (cl-function (lambda nil (cl-block foo 1)))) (x (symbol-function (quote foo)))) (unwind-protect (progn (fset (quote foo) x) (foo)) (fset (quote foo) x)))
> (letf* (((symbol-function (quote foo)) (cl-function (lambda nil (cl-block foo 1))))) (foo))
> (flet ((foo nil 1)) (foo))
> eval((flet ((foo nil 1)) (foo)) nil)
> eval-last-sexp-1(nil)
> eval-last-sexp(nil)
> call-interactively(eval-last-sexp nil nil)
>
> The macroexpansion is a bit strange:
Yes, it doesn't seem to be guarding for unfbound symbols…
> (let* ((x (cl-function (lambda nil (cl-block foo 1))))
> (x (symbol-function (quote foo))))
> (unwind-protect (progn
> (fset (quote foo) x)
> (foo))
> (fset (quote foo) x)))
>
> Two times `x', and those should probably gensyms, anyway...
They probably are.
Try:
(eq 'x (first (first (second (macroexpand '(flet ((foo () 1))
(foo)))))))
and try:
(let ((expansion (macroexpand '(flet ((foo () 1)) (foo)))))
(eq (first (first (second expansion)))
(first (second (second expansion)))))
--
__Pascal Bourguignon__ http://www.informatimago.com/
A bad day in () is better than a good day in {}.
next prev parent reply other threads:[~2012-06-27 14:42 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-27 12:36 problems with flet on last emacs Thierry Volpiatto
2012-06-27 12:49 ` Pascal J. Bourguignon
2012-06-27 15:29 ` Stefan Monnier
2012-06-27 16:38 ` Thierry Volpiatto
2012-06-28 6:53 ` Ivan Kanis
2012-06-28 7:31 ` Thierry Volpiatto
2012-06-29 5:42 ` Ivan Kanis
2012-06-29 6:17 ` Thierry Volpiatto
2012-07-12 8:22 ` Ivan Kanis
2012-07-12 14:40 ` Stefan Monnier
2012-07-12 16:44 ` Ivan Kanis
2012-11-09 17:41 ` João Távora
2012-11-09 19:23 ` Stefan Monnier
2012-11-10 14:12 ` João Távora
2012-11-10 22:46 ` Stefan Monnier
2012-11-10 23:07 ` João Távora
2012-11-10 23:38 ` Stefan Monnier
2012-11-12 8:02 ` Andreas Röhler
2012-06-27 13:24 ` Tassilo Horn
2012-06-27 13:43 ` Thierry Volpiatto
2012-06-27 14:27 ` Thierry Volpiatto
2012-06-27 14:42 ` Pascal J. Bourguignon [this message]
2012-06-27 15:55 ` Tassilo Horn
2012-06-27 16:29 ` Pascal J. Bourguignon
2012-06-27 19:42 ` Tassilo Horn
2012-06-27 19:46 ` Pascal J. Bourguignon
2012-06-27 15:01 ` Andreas Schwab
2012-06-27 16:03 ` Tassilo Horn
2012-06-27 16:22 ` Glenn Morris
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