From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Brandon Irizarry Newsgroups: gmane.emacs.bugs Subject: bug#65344: 28.2; Unable to Edebug cl-flet form which uses argument destructuring Date: Thu, 17 Aug 2023 11:42:06 -0400 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="000000000000988e010603204121" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="23210"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 65344@debbugs.gnu.org To: Gerd =?UTF-8?Q?M=C3=B6llmann?= Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Thu Aug 17 17:43:43 2023 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1qWf9y-0005s4-J6 for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 17 Aug 2023 17:43:43 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qWf9T-0000Jj-Iy; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable Destructured lambda-lists appear to be an Elisp extension to Common Lisp's argument notation, and the Emacs docs do mention them (though not in the Elisp manual; rather, it's in the CL-Lib manual). They even mention your point about such a lambda-list not being valid Common Lisp. >From the CL-Lib manual, 4.3.2 (Function Bindings): Functions defined by =E2=80=98cl-flet=E2=80=99 may use the full Common= Lisp argument notation supported by =E2=80=98cl-defun=E2=80=99; also, the f= unction body is enclosed in an implicit block as if by =E2=80=98cl-defun=E2=80=99. = *Note Program Structure::. Following the reference to Chapter 2, and heading into 2.1 (Argument Lists): Argument lists support =E2=80=9Cdestructuring=E2=80=9D. In Common Lisp, destructuring is only allowed with =E2=80=98defmacro=E2=80=99; this package= allows it with =E2=80=98cl-defun=E2=80=99 and other argument lists as well. That is, while 'defun' doesn't support this, 'cl-defun' (and, by extension, 'cl-flet') does. - Brandon On Thu, Aug 17, 2023 at 1:29=E2=80=AFAM Gerd M=C3=B6llmann wrote: > > (cl-flet ((fn ((min max)) > > (message "%d %d" min max))) > > (fn '(2 3))) > > > > The cl-flet form evaluates fine (e.g. with C-x C-e or C-M-x), which > > leads me to conclude that this construct is legal. > > I think this lambda-list is invalid. It certainly is invalid in CL, and > I can't find any extension mentioned in the Emacs docs. > > Why this doesn't signal an error at evaluation time, I don't know. If > you try this with defun, you get an error. > --000000000000988e010603204121 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Destructured lambda-lists appear to be an Elisp exten= sion to Common Lisp's argument notation,
and the Emacs docs d= o mention them (though not in the Elisp manual; rather, it's in the CL-= Lib manual).
They even mention your point about such a lambda-lis= t not being valid Common Lisp.

From the CL-Lib= manual, 4.3.2 (Function Bindings):

=C2=A0 =C2=A0= =C2=A0 Functions defined by =E2=80=98cl-flet=E2=80=99 may use the full Comm= on Lisp
=C2=A0 =C2=A0 =C2=A0argument notation supported by =E2=80=98cl-d= efun=E2=80=99; also, the function body
=C2=A0 =C2=A0 =C2=A0is enclosed i= n an implicit block as if by =E2=80=98cl-defun=E2=80=99. =C2=A0*Note
=C2= =A0 =C2=A0 =C2=A0Program Structure::.

Following th= e reference to Chapter 2, and heading into 2.1 (Argument Lists):
=

=C2=A0=C2=A0 Argument lists support =E2=80=9Cdestructur= ing=E2=80=9D.=C2=A0 In Common Lisp,
destructuring is only allowed with = =E2=80=98defmacro=E2=80=99; this package allows it
with =E2=80=98cl-defu= n=E2=80=99 and other argument lists as well.

= That is, while 'defun' doesn't support this, 'cl-defun'= (and, by extension, 'cl-flet') does.

- Br= andon

On Thu, Aug 17, 2023 at 1:29=E2=80=AFAM Gerd M=C3=B6llmann = <gerd.moellmann@gmail.com> wrote:
>= ; (cl-flet ((fn ((min max))
>=C2=A0 =C2=A0 =C2=A0 (message "%d %d" min max)))
>=C2=A0 =C2=A0(fn '(2 3)))
>
> The cl-flet form evaluates fine (e.g. with C-x C-e or C-M-x), which > leads me to conclude that this construct is legal.

I think this lambda-list is invalid.=C2=A0 It certainly is invalid in CL, a= nd
I can't find any extension mentioned in the Emacs docs.

Why this doesn't signal an error at evaluation time, I don't know.= =C2=A0 If
you try this with defun, you get an error.
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