Heya Ludo, On Thu 30 Jun 2011 12:44, Andy Wingo <wi...@pobox.com> writes:
> I think we should add `when' and `unless' to the default environment. > > They go like this: > > (define-syntax when > (syntax-rules () > ((_ test then then* ...) > (if test (begin then then* ... (if #f #f)))))) > > (define-syntax unless > (syntax-rules () > ((_ test else else* ...) > (if (not test) (begin else else* ... (if #f #f)))))) WDYT? `unless' is nice for assertions, `when' is its converse, and most Schemes have them. I would like to add them to Guile too. Andy -- http://wingolog.org/
