bug#46091: ido: Add support for tab completion using an alist collection.

[Keith David Bershatsky]

Thanks for having a look at this particular issue.

After evaluating the snippet, press the TAB key.  An error will occur in all 
recent versions of Emacs.

Keith

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> Date: [06-13-2022 12:04:31] <13 Jun 2022 21:04:31 +0200>
> From: Lars Ingebrigtsen <larsi@gnus.org>
> To: Keith David Bershatsky <esq@lawlist.com>
> Cc: 46091@debbugs.gnu.org
> Subject: Re: bug#46091: ido:  Add support for tab completion using an alist 
> collection.
> 
> Keith David Bershatsky <esq@lawlist.com> writes:
> 
> > Currently, ido does not support tab completion using an alist collection.
> >
> > (require 'ido)
> >
> > (let* ((alist '(("pine" . "cones")
> >                 ("oak" . "acorns")
> >                 ("maple" . "seeds")))
> >        (choice (ido-completing-read "CHOOSE:  " alist nil 'confirm)))
> >   (cdr (assoc choice alist)))
> >
> > ;;; Debugger entered--Lisp error: (wrong-type-argument listp "seeds")
> > ;;;   ido-no-final-slash(("maple" . "seeds"))
> > ;;;   ido-file-lessp(("maple" . "seeds") ("oak" . "acorns"))
> 
> (I'm going through old bug reports that unfortunately weren't resolved
> at the time.)
> 
> You say "currently", but not what Emacs version this was about.
> 
> I tried evaling the form above in Emacs 25.1 and Emacs 29, and it didn't
> fail in either of those cases, but perhaps there's something missing in
> the recipe?  Or has this gone away since whateve version you say this in?