Hi, Andy Wingo <wi...@pobox.com> skribis:
> 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. Yes, feel free. Ludo’.
