I'm not surprised, I pretty much expected this response, but I'm curious what the difficulty was. Is cond-as-void relied on that much more pervasively than mutable pairs? Is it exceedingly hard to add else-clauses to all the necessary conds? You two, Robby and Matthew, probably have a better idea than I do about the prevailing trends in the Racket code base.
Carl Eastlund On Tue, Oct 2, 2012 at 10:36 AM, Robby Findler <ro...@eecs.northwestern.edu>wrote: > IIRC, we even experimented with this one briefly and quickly gave up > as we got overwhelmed. > > Robby > > On Tue, Oct 2, 2012 at 9:22 AM, Matthew Flatt <mfl...@cs.utah.edu> wrote: > > I think this a great change for a future `racket2' (someone should be > > keeping a list of these), but it's too incompatible a change for `cond' > > in `racket'. > > > > At Tue, 2 Oct 2012 09:52:38 -0400, Carl Eastlund wrote: > >> 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 > >
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