From: Marco Antoniotti <marco.antoniotti@unimib.it>
To: emacs-devel@gnu.org
Subject: (declare (type (function...
Date: Tue, 7 May 2024 13:55:06 +0200 [thread overview]
Message-ID: <CAG0Nw2n9ReYn37-nSZ+fKbsoidVHZKcdUgtRQUjDHxZ9idPt+w@mail.gmail.com> (raw)
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Hi
I am at ELS 2024 in Vienna and I saw Andrea Corallo's presentation about
the introduction of the
(defun foo (x)
*(declare (type (function (integer) float))*
(+ x 42.0))
declaration.
IMHO (and, I am not afraid to say, of many common lispers) this is
shortsighted and a rather gratuitous departure from what CL does. With
some potential unintended consequences down the road.
The declaration proposed is for the *signature* of the function as a
whole. Using type may prevent ELisp from introducing the usual CL idiom,
as the following one
(let ((x 42) (y -1))
*(declare (type integer x y))* ; The type declaration refers to names x
and y.
...)
... unless you special case the type declaration with no name(s) following
the type spec.
My suggestion: keep type (and ftype) for doing things the CL way (which was
the PL/I way :) ) and introduce a signature spec to be meaningful only at
the function toplevel.
(defun foo (x)
*(declare (signature (function (integer) float))*
(+ x 42.0))
All the best
--
Marco Antoniotti, Professor tel. +39 - 02 64 48 79 01
DISCo, University of Milan-Bicocca U14 2043 http://dcb.disco.unimib.it
Viale Sarca 336
I-20126 Milan (MI) ITALY
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next reply other threads:[~2024-05-07 11:55 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-07 11:55 Marco Antoniotti [this message]
2024-05-07 16:55 ` (declare (type (function Tomas Hlavaty
2024-05-07 17:10 ` Marco Antoniotti
2024-05-07 17:38 ` Tomas Hlavaty
2024-05-07 17:52 ` Marco Antoniotti
2024-05-07 20:32 ` Andrea Corallo
2024-05-08 2:36 ` Emanuel Berg
2024-05-09 3:21 ` Tomas Hlavaty
2024-05-08 2:44 ` Emanuel Berg
2024-05-08 11:36 ` Marco Antoniotti
2024-05-09 3:33 ` Tomas Hlavaty
2024-05-09 13:19 ` Simon Leinen
2024-05-09 13:43 ` Emanuel Berg
2024-05-10 6:47 ` Andrea Corallo
2024-05-10 9:50 ` Marco Antoniotti
2024-05-10 10:21 ` Andrea Corallo
2024-05-10 11:53 ` Marco Antoniotti
2024-05-10 14:04 ` Stefan Monnier
2024-05-10 14:17 ` Marco Antoniotti
2024-05-11 10:29 ` Eli Zaretskii
2024-05-13 21:12 ` Andrea Corallo
2024-05-14 9:26 ` Andrea Corallo
2024-05-14 10:04 ` Marco Antoniotti
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