In addition to this, I want internal definitions in conds: (cond [test1 body1] (define var ...) [(test2 var) body2] [(test3 var) body3])
I have a macro that does these things: https://github.com/jeapostrophe/exp/blob/master/condd.rkt It's pretty cute Jay On Tue, Oct 2, 2012 at 7:58 AM, Carl Eastlund <c...@ccs.neu.edu> wrote: > Oh, no, as far as a "does it work out of the box" experiment goes, it fails. > Racket doesn't even compile. I meant more along the lines of our > immutable-cons experiment, where we fix a bunch of code and see how > problematic the compatibility issue becomes over time. > > Carl Eastlund > > > On Tue, Oct 2, 2012 at 9:56 AM, J. Ian Johnson <i...@ccs.neu.edu> wrote: >> >> This experiment should be easy to run, no? Change the default cond and run >> DrDr? >> -Ian >> ----- Original Message ----- >> From: "Carl Eastlund" <c...@ccs.neu.edu> >> To: "Racket Developers" <dev@racket-lang.org> >> Sent: Tuesday, October 2, 2012 9:52:38 AM GMT -05:00 US/Canada Eastern >> Subject: [racket-dev] Falling through cond clauses >> >> >> I often wish cond would raise an exception if all the tests failed and >> there were no else clause. I have taken to writing a macro to enforce this; >> I usually call it cond!. The void default for cond seems like an >> un-Racketish holdover from primarily-imperative programming. With some of >> the other changes we've made in Racket, are we willing to consider changing >> the fall-through behavior of cond? It seems like an experiment worth running >> to me. >> >> If not, I would at least like to add an erroring version of cond somewhere >> in the language. It's a shame to have to keep writing such a primitive >> feature. Right now in my dracula github repo I have cond! implemented in >> racket/cond and re-exported from racket, but I'm not thrilled about either >> the location or the name. I kept it out of racket/base so I could depend on >> the syntax collection for good source location reporting in the error >> message. >> >> Carl Eastlund >> >> _________________________ >> Racket Developers list: >> http://lists.racket-lang.org/dev >> > > > _________________________ > Racket Developers list: > http://lists.racket-lang.org/dev > -- Jay McCarthy <j...@cs.byu.edu> Assistant Professor / Brigham Young University http://faculty.cs.byu.edu/~jay "The glory of God is Intelligence" - D&C 93 _________________________ Racket Developers list: http://lists.racket-lang.org/dev
