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* bug#72313: 31.0.50; Warning about cl-member possibly being undefined when using cl-pushnew
@ 2024-07-26 20:29 Tassilo Horn
  2024-07-26 21:20 ` Jeremy Bryant via Bug reports for GNU Emacs, the Swiss army knife of text editors
  2024-07-27  7:01 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
  0 siblings, 2 replies; 11+ messages in thread
From: Tassilo Horn @ 2024-07-26 20:29 UTC (permalink / raw)
  To: 72313


The following non-sensical code is a MWE triggering the warning

  test.el: Warning: the function ‘cl-member’ might not be defined
           at runtime.

when byte-compiling it with

  emacs -Q --batch -f batch-byte-compile test.el

--8<---------------cut here---------------start------------->8---
;;  -*- lexical-binding: t; -*-
(eval-when-compile
  (require 'cl-lib))

(defun foo ()
  (let ((s (list 'a 'b)))
    (cl-pushnew (list 1 2 3)
                s
                :test (lambda (_a _b) nil))))
--8<---------------cut here---------------end--------------->8---

Code with that shape of cl-pushnew usage can be found in AUCTeX's
tex-info.el where it produces the same warning which sounds very strange
given that the complete file doesn't use cl-member.

I've checked the cl-lib code and could see that cl-pushnew expands to
something with cl-adjoin which in turn has a compiler macro
cl-compiler-macro-adjoin which could expand to something with cl-member
(but doesn't in this case, I think?)...

My assumption is that (eval-when-compile (require 'cl-lib)) should be
fine when using only macros from cl-lib which in turn should expand to
cl-free code, i.e., the byte code doesn't require cl-lib at runtime.
If, however, cl-pushnew can expand to something using cl-member (a
function), that wouldn't be true.


In GNU Emacs 31.0.50 (build 4, x86_64-pc-linux-gnu, GTK+ Version
 3.24.43, cairo version 1.18.0) of 2024-07-26 built on thinkpad-t440p
Repository revision: c22b4198b2e5a9d63109c5ceeb386fbb1904f5dc
Repository branch: master
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^ permalink raw reply	[flat|nested] 11+ messages in thread

end of thread, other threads:[~2024-07-31 19:55 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-07-26 20:29 bug#72313: 31.0.50; Warning about cl-member possibly being undefined when using cl-pushnew Tassilo Horn
2024-07-26 21:20 ` Jeremy Bryant via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-07-27  7:01 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-07-27  7:13   ` Tassilo Horn
2024-07-27  7:49     ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-07-27 15:29       ` Arash Esbati
2024-07-27 20:50         ` Tassilo Horn
2024-07-27 21:25           ` Arash Esbati
2024-07-31 17:44             ` Tassilo Horn
2024-07-31 19:55               ` Arash Esbati
2024-07-28  4:58           ` Eli Zaretskii

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