From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Qiantan Hong <qthong@stanford.edu>
Cc: "emacs-devel@gnu.org" <emacs-devel@gnu.org>
Subject: Re: completing-read, empty collection, require match
Date: Sat, 04 Dec 2021 10:03:23 -0500 [thread overview]
Message-ID: <jwvbl1wwh05.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <4BB55705-49C3-45E0-80CE-2F56E2BD9DE4@stanford.edu> (Qiantan Hong's message of "Sat, 4 Dec 2021 14:30:09 +0000")
Qiantan Hong [2021-12-04 14:30:09] wrote:
> (completing-read "test: " nil nil t)
> will pop up a prompt in mini buffer, pretend asking you for something
> and then inevitably fail.
>
> Is there some rationale behind the current behavior?
> Failing immediately seems strictly more efficient.
Yes, it would be more "efficient" in this case if `completing-read`
catches the situation and signals an error, but I don't think such an
optimization is worthwhile: the better optimization is to not make such
a call at all.
Stefan
next prev parent reply other threads:[~2021-12-04 15:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-04 14:30 completing-read, empty collection, require match Qiantan Hong
2021-12-04 15:03 ` Stefan Monnier [this message]
2021-12-05 11:21 ` Thierry Volpiatto
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