Subject: Re: bug#47161: 28.0.50; [feature/native-comp] Failure to native-compile bytecomp.el etc.

From: Eli Zaretskii <[email-masked]>
Date: Fri, 19 Mar 2021 17:28:55 +0200

> From: Stefan Monnier <[email-masked]>
> Cc: Andrea Corallo <[email-masked]>,  [email-masked]
> Date: Tue, 16 Mar 2021 21:27:11 -0400
> 
> > I also suddenly see another byte-compilation message:
> >
> >     ELC      emacs-lisp/byte-opt.elc
> >   Compiler-macro error for cl--block-wrapper: (error "(setf seq-elt) is already defined as something else than a generic function")
> >   Eager macro-expansion failure: (error "(setf seq-elt) is already defined as something else than a generic function")
> >
> > What causes this?
> 
> Can you try and reproduce this while `macroexp--debug-eager` is set to
> a non-nil value so we hopefully get a backtrace?

Sorry, it stopped happening for me, so I cannot reproduce this
anymore.