* Request for assistance: (assertion-violation) unbound variable
@ 2017-06-08 10:28 Peter Silcock
[not found] ` <CABPkNKk9Nm2GQ9=Su-B8jKrNsAwcow5FRqwOcz4dcCKQ3c7ELQ@mail.gmail.com>
2017-06-11 6:23 ` Alex Vong
0 siblings, 2 replies; 3+ messages in thread
From: Peter Silcock @ 2017-06-08 10:28 UTC (permalink / raw)
To: Guile Mailing List
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
^ permalink raw reply [flat|nested] 3+ messages in thread[parent not found: <CABPkNKk9Nm2GQ9=Su-B8jKrNsAwcow5FRqwOcz4dcCKQ3c7ELQ@mail.gmail.com>]
* Re: Request for assistance: (assertion-violation) unbound variable [not found] ` <CABPkNKk9Nm2GQ9=Su-B8jKrNsAwcow5FRqwOcz4dcCKQ3c7ELQ@mail.gmail.com> @ 2017-06-08 11:40 ` Peter Silcock 0 siblings, 0 replies; 3+ messages in thread From: Peter Silcock @ 2017-06-08 11:40 UTC (permalink / raw) To: Guile Mailing List Many thanks for your assistance. Peter. ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Request for assistance: (assertion-violation) unbound variable 2017-06-08 10:28 Request for assistance: (assertion-violation) unbound variable Peter Silcock [not found] ` <CABPkNKk9Nm2GQ9=Su-B8jKrNsAwcow5FRqwOcz4dcCKQ3c7ELQ@mail.gmail.com> @ 2017-06-11 6:23 ` Alex Vong 1 sibling, 0 replies; 3+ messages in thread From: Alex Vong @ 2017-06-11 6:23 UTC (permalink / raw) To: Peter Silcock; +Cc: Guile Mailing List [-- Attachment #1: Type: text/plain, Size: 1022 bytes --] 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! [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 832 bytes --] ^ permalink raw reply [flat|nested] 3+ messages in thread
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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
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