GNU bug report logs - #41864
28.0.50; funcall: attempting to call a macro does not always complain

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Nick Dokos <ndokos <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; funcall: attempting to call a macro does not always complain
Date: Sun, 14 Jun 2020 22:20:58 -0400

----
The doc (info "(elisp) Calling functions") says:

     The argument FUNCTION must be either a Lisp function or a primitive
     function.  Special forms and macros are not allowed, because they
     make sense only when given the unevaluated argument expressions.
     ‘funcall’ cannot provide these because, as we saw above, it never
     knows them in the first place.

If I define a function, I can funcall it:

   (defun func/z () "z")
   (funcall (function func/z)) ==> "z"
   (funcall 'func/z) ==> "z"

If I attempt the same thing with a macro however, it does not always
fail:

    (defmacro mac/z () "z")
    (funcall 'mac/z) ==> fails with Invalid function: mac/z
    (funcall (function mac/z)) ==> "z"

Should it fail in the last case?

This was brought up in the following question in the  Emacs Stack Exchange:

    https://emacs.stackexchange.com/questions/59066/inconsistent-behavior-when-calling-funcall-with-a-macro/59075#59075


----


In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.13, cairo version 1.16.0)
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ol-docview doc-view jka-compr image-mode exif dired dired-loaddefs
ol-bibtex bibtex ol-bbdb ol-w3m org-agenda org-refile appt diary-lib
diary-loaddefs url-config org ob ob-tangle ob-ref ob-lob ob-table ob-exp
org-macro org-footnote org-src ob-comint org-pcomplete pcomplete comint
ansi-color ring org-list org-faces org-entities time-date noutline
outline easy-mmode org-version ob-emacs-lisp ob-core ob-eval org-table
ol org-keys org-compat advice org-macs org-loaddefs format-spec
find-func cal-menu calendar cal-loaddefs constants-config time cus-start
cus-load smtpmail-config smime dig ldap edmacro kmacro gnus-config
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eieio-compat slime-autoloads info package easymenu browse-url
url-handlers url-parse auth-source cl-seq eieio eieio-core cl-macs
eieio-loaddefs password-cache json subr-x map url-vars seq byte-opt gv
bytecomp byte-compile cconv cl-loaddefs cl-lib tooltip eldoc electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page tab-bar menu-bar rfn-eshadow isearch timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame minibuffer cl-generic cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese composite charscript charprop case-table epa-hook
jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote threads dbusbind inotify lcms2 dynamic-setting
system-font-setting font-render-setting cairo move-toolbar gtk x-toolkit
x multi-tty make-network-process emacs)

Memory information:
((conses 16 471107 62507)
 (symbols 48 44418 1)
 (strings 32 157197 3290)
 (string-bytes 1 5186995)
 (vectors 16 58703)
 (vector-slots 8 701793 33832)
 (floats 8 868 191)
 (intervals 56 585 0)
 (buffers 992 20))

-- 
Nick

Message #8 received at 41864 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Nick Dokos <ndokos <at> gmail.com>
Cc: 41864 <at> debbugs.gnu.org
Subject: Re: bug#41864: 28.0.50; funcall: attempting to call a macro does
 not always complain
Date: Sat, 17 Oct 2020 13:02:02 +0200

Nick Dokos <ndokos <at> gmail.com> writes:

> If I attempt the same thing with a macro however, it does not always
> fail:
>
>     (defmacro mac/z () "z")
>     (funcall 'mac/z) ==> fails with Invalid function: mac/z
>     (funcall (function mac/z)) ==> "z"
>
> Should it fail in the last case?

That is indeed pretty odd.

(eq 'mac/z (function mac/z))
=> t

Does anybody here understand what's happening here?  

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #11 received at 41864 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Nick Dokos <ndokos <at> gmail.com>
Cc: 41864 <at> debbugs.gnu.org
Subject: Re: bug#41864: 28.0.50; funcall: attempting to call a macro does
 not always complain
Date: Sat, 17 Oct 2020 14:50:35 +0200

On Jun 14 2020, Nick Dokos wrote:

> If I attempt the same thing with a macro however, it does not always
> fail:
>
>     (defmacro mac/z () "z")
>     (funcall 'mac/z) ==> fails with Invalid function: mac/z
>     (funcall (function mac/z)) ==> "z"
>
> Should it fail in the last case?

Worksforme.

ELISP> (defmacro mac/z () "z")
mac/z
ELISP> (funcall (function mac/z))
*** Eval error ***  Invalid function: mac/z

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

Message #14 received at 41864 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Andreas Schwab <schwab <at> linux-m68k.org>, Nick Dokos <ndokos <at> gmail.com>
Cc: 41864 <at> debbugs.gnu.org
Subject: Re: bug#41864: 28.0.50; funcall: attempting to call a macro does not
 always complain
Date: Sat, 17 Oct 2020 14:11:53 +0000

Andreas Schwab <schwab <at> linux-m68k.org> writes:

> Worksforme.
>
> ELISP> (defmacro mac/z () "z")
> mac/z
> ELISP> (funcall (function mac/z))
> *** Eval error ***  Invalid function: mac/z

I see the same in IELM, but not in *scratch*.

Message #17 received at 41864 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: Nick Dokos <ndokos <at> gmail.com>, 41864 <at> debbugs.gnu.org
Subject: Re: bug#41864: 28.0.50; funcall: attempting to call a macro does
 not always complain
Date: Sat, 17 Oct 2020 20:08:46 +0200

On Okt 17 2020, Stefan Kangas wrote:

> Andreas Schwab <schwab <at> linux-m68k.org> writes:
>
>> Worksforme.
>>
>> ELISP> (defmacro mac/z () "z")
>> mac/z
>> ELISP> (funcall (function mac/z))
>> *** Eval error ***  Invalid function: mac/z
>
> I see the same in IELM, but not in *scratch*.

ELISP> (macroexpand-all (eval-sexp-add-defvars (elisp--eval-defun-1 (macroexpand '(funcall (function mac/z))))))
(progn "z")

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

Message #20 received at 41864 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: Nick Dokos <ndokos <at> gmail.com>, 41864 <at> debbugs.gnu.org,
 Stefan Kangas <stefankangas <at> gmail.com>
Subject: Re: bug#41864: 28.0.50; funcall: attempting to call a macro does
 not always complain
Date: Sun, 18 Oct 2020 09:57:53 +0200

Andreas Schwab <schwab <at> linux-m68k.org> writes:

> ELISP> (macroexpand-all (eval-sexp-add-defvars (elisp--eval-defun-1
> (macroexpand '(funcall (function mac/z))))))
> (progn "z")

And

(macroexpand-all (eval-sexp-add-defvars (elisp--eval-defun-1 (macroexpand '(funcall 'mac/z)))))
=> (funcall 'mac/z)                                         

Which is what the bug reporter is wondering about.  The doc string says

--
Like ‘quote’, but preferred for objects which are functions.
--

And it's not quite like `quote', as the examples show us, and the
documentation should mention this.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #23 received at 41864 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Nick Dokos <ndokos <at> gmail.com>, 41864 <at> debbugs.gnu.org,
 Stefan Kangas <stefankangas <at> gmail.com>
Subject: Re: bug#41864: 28.0.50; funcall: attempting to call a macro does
 not always complain
Date: Sun, 18 Oct 2020 10:52:45 +0200

On Okt 18 2020, Lars Ingebrigtsen wrote:

> Andreas Schwab <schwab <at> linux-m68k.org> writes:
>
>> ELISP> (macroexpand-all (eval-sexp-add-defvars (elisp--eval-defun-1
>> (macroexpand '(funcall (function mac/z))))))
>> (progn "z")
>
> And
>
> (macroexpand-all (eval-sexp-add-defvars (elisp--eval-defun-1 (macroexpand '(funcall 'mac/z)))))
> => (funcall 'mac/z)                                         
>
> Which is what the bug reporter is wondering about.

And what do you get when you eval that?

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

Message #26 received at 41864 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: Nick Dokos <ndokos <at> gmail.com>, 41864 <at> debbugs.gnu.org,
 Stefan Kangas <stefankangas <at> gmail.com>
Subject: Re: bug#41864: 28.0.50; funcall: attempting to call a macro does
 not always complain
Date: Sun, 18 Oct 2020 11:03:18 +0200

Andreas Schwab <schwab <at> linux-m68k.org> writes:

> And what do you get when you eval that?

An error.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #29 received at 41864 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Nick Dokos <ndokos <at> gmail.com>, 41864 <at> debbugs.gnu.org,
 Stefan Kangas <stefankangas <at> gmail.com>
Subject: Re: bug#41864: 28.0.50; funcall: attempting to call a macro does
 not always complain
Date: Sun, 18 Oct 2020 11:34:32 +0200

On Okt 18 2020, Lars Ingebrigtsen wrote:

> Andreas Schwab <schwab <at> linux-m68k.org> writes:
>
>> And what do you get when you eval that?
>
> An error.

So eveything works as expected.

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

Message #32 received at 41864 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: Nick Dokos <ndokos <at> gmail.com>, 41864 <at> debbugs.gnu.org,
 Stefan Kangas <stefankangas <at> gmail.com>
Subject: Re: bug#41864: 28.0.50; funcall: attempting to call a macro does
 not always complain
Date: Sun, 18 Oct 2020 11:45:34 +0200

Andreas Schwab <schwab <at> linux-m68k.org> writes:

> So eveything works as expected.

Your expectations are unexpected.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #35 received at 41864 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Nick Dokos <ndokos <at> gmail.com>, 41864 <at> debbugs.gnu.org,
 Stefan Kangas <stefankangas <at> gmail.com>
Subject: Re: bug#41864: 28.0.50; funcall: attempting to call a macro does
 not always complain
Date: Sun, 18 Oct 2020 11:51:18 +0200

On Okt 18 2020, Lars Ingebrigtsen wrote:

> Andreas Schwab <schwab <at> linux-m68k.org> writes:
>
>> So eveything works as expected.
>
> Your expectations are unexpected.

In which way?

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

Message #38 received at 41864 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: Nick Dokos <ndokos <at> gmail.com>, 41864 <at> debbugs.gnu.org,
 Stefan Kangas <stefankangas <at> gmail.com>
Subject: Re: bug#41864: 28.0.50; funcall: attempting to call a macro does
 not always complain
Date: Mon, 19 Oct 2020 10:19:24 +0200

Andreas Schwab <schwab <at> linux-m68k.org> writes:

> On Okt 18 2020, Lars Ingebrigtsen wrote:
>
>> Andreas Schwab <schwab <at> linux-m68k.org> writes:
>>
>>> So eveything works as expected.
>>
>> Your expectations are unexpected.
>
> In which way?

In that the `function' doc string doesn't mention anything about this.
I've now amended it.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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