GNU bug report logs - #17474
Making *unspecified* equivalent to (values) would seem convenient

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Message #23 received at 17474 <at> debbugs.gnu.org (full text, mbox):

From: Mark H Weaver <mhw <at> netris.org>
To: David Kastrup <dak <at> gnu.org>
Cc: 17474 <at> debbugs.gnu.org
Subject: Re: bug#17474: Another point
Date: Sun, 22 Jun 2014 01:17:39 -0400

David Kastrup <dak <at> gnu.org> writes:

> It is worth pointing out that the current state of Guile is inconsistent
> regarding the return value of control structures: one primitive control
> structure builder is call/cc, and its normal use does not return
> *unspecified* but (values):
>
> scheme@(guile-user)> (call-with-values (lambda () (call/cc (lambda (exit) (exit)))) list)
> $5 = ()

The values returned are the arguments passed to 'exit'.  Normal use is
to pass the desired return value(s) to 'exit'.

     Mark

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