racket/contract warning

Folks,

I have just upgraded some software to use Racket 6.4. My code sets
log-max-level to debug, and then cranks up the level on the more
chatty contributors.

In 6.4, a new warning (or collection of warnings) is thrown by the
racket/contract topic.

Is this intentional?

The warning is raised by doing nothing more than just running the
Racket REPL:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
$ PLTSTDERR=warning@racket/contract racket
Welcome to Racket v6.4.
racket/contract: no late-neg-projection passed to build-contract-property
  (unpack24 . #(struct:srcloc
#<path:/usr/local/racket/collects/racket/contract/private/prop.rkt> 271
0 8903 1608))
  (|[running body]| . #(struct:srcloc
#<path:/usr/local/racket/collects/racket/contract/private/opt.rkt> #f #f
#f #f))
  (|[traversing imports]| . #(struct:srcloc
#<path:/usr/local/racket/collects/racket/contract/private/arr-i.rkt> #f
#f #f #f))
racket/contract: no late-neg-projection passed to build-contract-property
  (unpack24 . #(struct:srcloc
#<path:/usr/local/racket/collects/racket/contract/private/prop.rkt> 271
0 8903 1608))
  (|[running body]| . #(struct:srcloc
#<path:/usr/local/racket/collects/racket/private/class-c-new.rkt> #f #f
#f #f))
racket/contract: no late-neg-projection passed to build-contract-property
  (unpack24 . #(struct:srcloc
#<path:/usr/local/racket/collects/racket/contract/private/prop.rkt> 271
0 8903 1608))
  (|[running body]| . #(struct:srcloc
#<path:/usr/local/racket/collects/racket/contract/private/opt.rkt> #f #f
#f #f))
>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Should the humble application programmer be changing its behaviour to
satisfy racket/contract; or is this just some debug that has been left
at too high an importance level?

Tim

-- 
Tim Brown CEng MBCS <[email protected]>
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