bug#31525: 26.0.91; rmail

[Eli Zaretskii <eliz@gnu.org>]

> Date: Fri, 18 May 2018 14:31:32 -0700
> From: Jeff Sondeen <sondeen@usc.edu>
> 
> 
> Hi, I'm using M-x rmail, but having trouble with the 'set-rmail-inbox-list'
> command. While i can successfully do:
> 
>   (rmail "~/RMAIL.180517")
> 
> and
> 
>   (rmail-summary-get-new-mail "~/mbox")
> 
> when i'm in the emacs window with 'RMAIL major mode' and type: M-x
> set-rmail-inbox-list
> 
> and it prompts:
> 
>   Set mailbox list to (comma-separated list of filenames):
> 
> and i type:
> 
>   ~/mbox
> 
> i get the following error:
> 
>  set-rmail-inbox-list: Wrong type argument: sequencep, 109

I cannot reproduce this, neither in the 26.0.91 pretest nor with the
more recent RC1.

Does this happen in "emacs -Q"?  If not, perhaps your recipe lacks a
few steps that your customizations add to the puzzle?

> Note that the command requires me to be in the window with 'RMAIL
> major mode', not allowing typing it in a window with 'RMAIL Summary
> mode' (minor gripe)

That's by design.  We could perhaps allow this also in the Summary
buffer, but let's first fix the original problem, okay?