[racket-dev] check-match?

>  (? P) => (lambda (x) (match x [P true] [_ false]))

I like this quite a bit.  It wouldn't be crazy to add it as
match-pred(icate) right next to match-lambda, match-let, and friends (
http://docs.racket-lang.org/reference/match.html?q=match&q=match-pred#(form._((lib._racket/match..rkt)._match-lambda))
).

Then, for rackunit, it's just up to how much we like writing

(check-match foo P)

vs.

(check-pred (match-pred P) foo)

Both seem handy to me.
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