Peter Silcock <pe...@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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