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bug#57397: 29.0.50; cl-letf blindly macroexpands places
From: |
Michael Heerdegen |
Subject: |
bug#57397: 29.0.50; cl-letf blindly macroexpands places |
Date: |
Thu, 25 Aug 2022 06:42:17 +0200 |
Hello,
background: to get rid of warnings about the recently obsoleted
generalized variables in my init file... because I'm lazy and wanted to
try (and there were only two) I blindly replaced them with synthetic
places - like this:
#+begin_src emacs-lisp
(defun test1 (b query)
(cl-letf (((buffer-local-value 'buffer-save-without-query b)
(or buffer-save-without-query query)))
(with-current-buffer b (save-buffer))))
;; ~~>
(defun test2 (b query)
(cl-letf (((gv-synthetic-place
(buffer-local-value 'buffer-save-without-query b)
(lambda (v) `(setq-local buffer-save-without-query ,v)))
(or buffer-save-without-query query)))
(with-current-buffer b (save-buffer))))
#+end_src
[ I know it is an nonsense example wrt what it does and how it does it,
that doesn't matter. ]
This should get rid of the warning - but in this case it doesn't (in
the other it did). The reason is that Stefan made cl-letf (the helper
cl--letf more precisely), macroexpand each place:
| 91a7f934ac * lisp/emacs-lisp/cl-macs.el: Fix bug#26073.
to support symbol macros better:
#+begin_src emacs-lisp
(defun cl--letf (bindings simplebinds binds body)
;; It's not quite clear what the semantics of cl-letf should be...10..
(if (null bindings)
(if (and (null binds) (null simplebinds)) (macroexp-progn body)..20..)
(let* ((binding (car bindings))
(place (macroexpand (car binding)
macroexpand-all-environment)));<--!!
(gv-letplace (getter setter) place..12..))))
#+end_src
I think this is an error in the general case. Maybe it's enough to
expand only symbol macros? It's at least always wrong when (car PLACE)
is a macro name with a gv spec defined.
TIA,
Michael.
In GNU Emacs 29.0.50 (build 2, x86_64-pc-linux-gnu, X toolkit, cairo
version 1.16.0, Xaw scroll bars) of 2022-08-25 built on drachen
Repository revision: bd5b704447ac5ec0559a824209bb01b271d29959
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Debian GNU/Linux 11 (bullseye)
Configured using:
'configure --with-x-toolkit=lucid'
- bug#57397: 29.0.50; cl-letf blindly macroexpands places,
Michael Heerdegen <=