Subject: bug#28774: Master, emacs-26: Can't add text property to built-in function name.

From: Noam Postavsky <[email-masked]>
Date: Tue, 10 Oct 2017 10:12:08 -0400

On Tue, Oct 10, 2017 at 10:01 AM, Drew Adams <[email-masked]> wrote:
>> It seems ido-completions relies on (format "%s" str) to return a copy of
>> str.  This fixes it:
>
> If `format' no longer always copies STR in this context then
> its doc should be updated, I think.

It has been, see https://debbugs.gnu.org/cgi/bugreport.cgi?bug=28625