From: Alex Vong <alexvong1995@gmail.com>
To: Peter Silcock <peter@fastmail.uk>
Cc: Guile Mailing List <guile-user@gnu.org>
Subject: Re: Request for assistance: (assertion-violation) unbound variable
Date: Sun, 11 Jun 2017 14:23:09 +0800 [thread overview]
Message-ID: <87r2yr9h6a.fsf@gmail.com> (raw)
In-Reply-To: <1496917737.4841.1.camel@fastmail.uk> (Peter Silcock's message of "Thu, 08 Jun 2017 11:28:57 +0100")
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Peter Silcock <peter@fastmail.uk> writes:
> As a newcomer to Guile/Scheme, I am working my way through some
> exercises which require the use of an (assertion-violation) procedure
> to trap an error condition, specifically:
>
> (if (empty? queue)
> (assertion-violation 'getq "Queue is empty")))
>
> When I run the code (which I have checked with the answer given in the
> book), I am presented with the following output: "In procedure module-
> lookup: Unbound variable: assertion-violation."
>
> So far I have found no pointers to a solution in the reference manual
> or on the web. My assumption is that I am missing a module or library
> from somewhere, but don't know how to set about identifying it. Chicken
> Scheme also responds with the same error.
>
> Guile version 2.0.13 on Debian Stretch 4.9.0-3-amd64.
>
> Any suggestions please? Thanks in anticipation,
>
> Peter Silcock
I think you have to import the r6rs base library:
(use-modules (rnrs base))
Welcome to guile!
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prev parent reply other threads:[~2017-06-11 6:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-08 10:28 Request for assistance: (assertion-violation) unbound variable Peter Silcock
[not found] ` <CABPkNKk9Nm2GQ9=Su-B8jKrNsAwcow5FRqwOcz4dcCKQ3c7ELQ@mail.gmail.com>
2017-06-08 11:40 ` Peter Silcock
2017-06-11 6:23 ` Alex Vong [this message]
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