Subject: Re: bug#78593: 31.0.50; describe-key broken on interactive lambdas

From: Eli Zaretskii <[email-masked]>
Date: Sat, 28 Jun 2025 12:06:00 +0300

> Cc: [email-masked], [email-masked]
> Date: Sat, 07 Jun 2025 11:40:32 +0300
> From: Eli Zaretskii <[email-masked]>
> 
> Ping!  Stefan, please chime in.
> 
> > Cc: [email-masked]
> > Date: Mon, 26 May 2025 19:46:21 +0300
> > From: Eli Zaretskii <[email-masked]>
> > 
> > > Date: Mon, 26 May 2025 21:16:22 +0530 (IST)
> > > From: Madhu <[email-masked]>
> > > 
> > > On recent master, but this seems to have been broken for a while:
> > > 
> > > $ emacs -Q -eval '(define-key global-map (kbd "<f11>") (lambda () (interactive) (bury-buffer)))'
> > > 
> > > C-h v <f11>
> > > 
> > > throws an error:
> > > 
> > > function-get: Wrong type argument: symbolp, #[nil ((bury-buffer)) (t) nil nil nil]
> > > 
> > > Acktually the *Help* buffer is formatted with sufficient information,
> > > but the error prevents it from being displayed.
> > 
> > Thanks.
> > 
> > Stefan, this is due to your change:
> > 
> >   commit a4ec9ca12969018cdf15b8cc713b3ba054326f99
> >   Author:     Stefan Kangas <[email-masked]>
> >   AuthorDate: Tue Apr 1 21:25:33 2025 +0200
> >   Commit:     Stefan Kangas <[email-masked]>
> >   CommitDate: Tue Apr 1 21:25:33 2025 +0200
> > 
> >       function-put: signal error with non-symbol
> > 
> >       * lisp/subr.el (function-get): Signal an error if given a non-symbol
> >       for consistency with 'get'.
> >       * test/lisp/subr-tests.el (subr-butlast): Test for the above.
> > 
> > Any reasons not to revert that?  function-get correctly returns nil if
> > its argument is not a symbol, so why should this signal an error?

No further comments, so I've now reverted the offending commit, and
I'm closing this bug.