bug#50173: 27.1; M-x notmuch fails with 'Invalid read syntax: "#"'

[Eli Zaretskii]

> From: Charles-André Roy <caroy47@videotron.ca>
> Date: Mon, 23 Aug 2021 12:01:45 -0400
> 
> 
> After having installed Debian 11 Bullseye, I tried to lauch Notmuch with
> 
> M-x notmuch
> 
> The following message appeared in the mini-buffer :
> 
> Invalid read syntax: "#"
> 
> and the processing of the command stopped.

Please set debug-on-error non-nil, repeat the recipe, and post the
backtrace.

Also, I see this error message in your session:

  bookmarks has auto save data; consider M-x recover-this-file
  Error: (error "File not in bookmark format: /home/charles/.emacs.d/bookmarks")

Could this be related?

Thanks.