[racket-dev] check-match?

From: Shriram Krishnamurthi (sk at cs.brown.edu)
Date: Mon Nov 19 20:31:19 EST 2012

Predicates in general would be really awesome.  I think the testing
infrastructure for Sperber's book (DMDA) has something like this.

Making it lightweight is what matters most, whether through a new
match form or a more general predicate form.


On Mon, Nov 19, 2012 at 8:25 PM, David Van Horn <dvanhorn at ccs.neu.edu> wrote:
> On 11/19/12 8:20 PM, Joe Gibbs Politz wrote:
>>  > Yeah, that is very nice! (It should begin with "check" not "test"
>> tho, right?)
>> Indeed; Jonah was writing w.r.t plai, which uses test.  Should use
>> check- in rackunit.
>> I noticed that this also violates, from the rackunit docs:
>> "Although checks are implemented as macros, which is necessary to grab
>> source location, they are conceptually functions. This means, for
>> instance, checks always evaluate their arguments."
>> I suppose this should go in a separate section of "additional checks" or
>> some such?
> Maybe the right thing to do is make it lightweight to write predicates with
> match so that you don't even need a separate testing form?
> Something like (? P) => (lambda (x) (match x [P true] [_ false]))
> David
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