[racket-dev] Is this expected behavior?

On a freshly pulled and compiled racket:

jordan at serenity ~> racket
Welcome to Racket v5.3.0.24.
> (enter! slideshow/pict)
define-values: assignment disallowed;
 cannot re-define a constant
  constant: invoke-unit/core
  in module: "/usr/local/lib/racket/collects/racket/unit.rkt"
  context...:
   /usr/local/lib/racket/collects/racket/unit.rkt: [running body]
   standard-module-name-resolver
   /usr/local/lib/racket/collects/mzlib/unit.rkt: [traversing imports]
   /usr/local/lib/racket/collects/texpict/mrpict.rkt: [traversing imports]
   /usr/local/lib/racket/collects/slideshow/pict.rkt: [traversing imports]
   /usr/local/lib/racket/collects/racket/enter.rkt:51:0: enter-require
   /usr/local/lib/racket/collects/racket/enter.rkt:33:0: do-enter!
   /usr/local/lib/racket/collects/racket/private/misc.rkt:87:7
> 

I think it has to do with the new module system?

- Jordan