bug#20705: Emacs segfaults when typing "(yas-expand" after M-: in yas-minor-mode

[Eli Zaretskii <eliz@gnu.org>]

Ping!  Clément, any word on this?

> Date: Wed, 03 Jun 2015 18:29:06 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: clement.pitclaudel@live.com, 20705@debbugs.gnu.org
> 
> > From: Johan Bockgård <bojohan@gnu.org>
> > Cc: 20705@debbugs.gnu.org, Eli Zaretskii <eliz@gnu.org>
> > Date: Tue, 02 Jun 2015 19:32:50 +0200
> > 
> > The code looks like this:
> > 
> >     (defun yas--keybinding-beyond-yasnippet ()
> >       "Get current keys's binding as if YASsnippet didn't exist."
> >       (let* ((yas-minor-mode nil)
> >              (yas--direct-keymaps nil)
> >              (keys (this-single-command-keys)))
> >         (or (key-binding keys t)
> >             (key-binding (yas--fallback-translate-input keys) t))))
> > 
> > Apparently this-single-command-keys returns [] (empty vector) when run
> > from a timer. This in turn makes key-binding crash.
> 
> Thanks for the analysis.
> 
> Clément, can you try the patch below?
> 
> diff --git a/src/keymap.c b/src/keymap.c
> index 8f4ac0d..b69b409 100644
> --- a/src/keymap.c
> +++ b/src/keymap.c
> @@ -1652,10 +1652,14 @@ Returns nil if COMMAND is not remapped (or not a symbol).
>  
>    if (NILP (position) && VECTORP (key))
>      {
> -      Lisp_Object event
> -	/* mouse events may have a symbolic prefix indicating the
> -	   scrollbar or mode line */
> -	= AREF (key, SYMBOLP (AREF (key, 0)) && ASIZE (key) > 1 ? 1 : 0);
> +      Lisp_Object event;
> +
> +      if (ASIZE (key) == 0)
> +	return Qnil;
> +
> +      /* mouse events may have a symbolic prefix indicating the
> +	 scrollbar or mode line */
> +      event = AREF (key, SYMBOLP (AREF (key, 0)) && ASIZE (key) > 1 ? 1 : 0);
>  
>        /* We are not interested in locations without event data */
>  
> 
> 
> 
>