bug#3662: Possible problem with ido-completing-read

[Stephen Berman <stephen.berman@gmx.net>]

On Wed, 24 Jun 2009 07:37:42 +1000 Peter Milliken <peter.milliken@gmail.com> wrote:

> This bug is also present in Emacs 22.3. I am attempting to use
> ido-completing-read in a defun and the function "hangs" at the prompt
> i.e. it does no completion at all, it will not allow me to cancel the
> command, or accept a string typed in followed by RET.
>
> I have produced a small test function to attempt to minimise possible
> problems on my part:
>
> (defun test ()
>   (interactive)
>   (let ((a)(d)) 
>     (setq d '("abc" "xyz" "abe" "def"))
>     (setq a (ido-completing-read "prompt: " d))))
>
> My *understanding* of reading the defun documentation is that I should
> be able to type "a<TAB>" (at the prompt) and have a completion list of
> "abc" and "abe" offered. But this does not happen, all I get is "a
> TAB". If I hit C-g nothing happens, the prompt line remains at the
> command line.

I get this behavior as well (with GNU Emacs 23.1.50.1
(i686-pc-linux-gnu, GTK+ Version 2.14.4) of 2009-06-23 on escher).
However, if I add `(ido-mode 1)' before the first setq, then it works as
I assume it's supposed to: typing `M-x test' shows "prompt: {abc | xyz |
abe | def}" in the minibuffer, and then typing `a' (without subsequent
TAB) shows "prompt: a[b] {abc | abe}", and `C-g' quits the minibuffer.

Steve Berman