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bug#25312: Invalid options for slot ...

From: Stefan Monnier
Subject: bug#25312: Invalid options for slot ...
Date: Sat, 31 Dec 2016 10:42:24 -0500

Package: Emacs
Version: 25.1.50

The following commit:

    commit eb610f270ea919107b10bb8ece200a87abac6e0e
    Author: Johan Bockgård <address@hidden>
    Date:   Tue Oct 18 22:28:17 2016 +0200
        cl-defstruct: Fix debug spec and check of slot options
        * lisp/emacs-lisp/cl-macs.el (cl-defstruct): Improve checking of slot
        option syntax.  Fix debug spec.  (Bug#24700)

Is a bit too strict: it causes various packages (such as the GNU ELPA
packages `xpm`, `dbus-codegen`, and `gnorb`) to signal an error
during compilation.  This is typically because they use

    (cl-defstruct ...
      (slotname :read-only t)

instead of

    (cl-defstruct ...
      (slotname nil :read-only t)

We should fix those packages, but they worked just fine until now
despite this mistake, so we shouldn't break them gratuitously.  IOW the
error we signal should be changed to a warning, and it should be made
more clear, since I expect many coders won't understand what it means
(they'll look at their slot definition and will think "Huh?  I only use
the option :read-only, and that should be valid!").


In GNU Emacs (x86_64-unknown-linux-gnu, GTK+ Version 3.20.6)
 of 2016-08-07 built on alfajor
Repository revision: 1662ba23be7859f61e3617e323f3234c5f82507c
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:     Debian GNU/Linux testing (stretch)

Recent messages:
Warning: turn-on-eldoc-mode is obsolete!
Warning: hide-sublevels is obsolete!
Mark saved where search started
Reverting file ~/src/emacs/trunk/lisp/emacs-lisp/cl-macs.el...
Warning: turn-on-eldoc-mode is obsolete!
Warning: hide-sublevels is obsolete!
Reverting file ~/src/emacs/trunk/lisp/emacs-lisp/cl-macs.el...done
Mark saved where search started [2 times]
Mark set [2 times]

Configured using:
 'configure -C --enable-checking --enable-check-lisp-object-type
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