[racket] profj

I would like to install and use profj in Racket. It would be great if profj
could work like it used to do in PLT 4.1. I downloaded the port by M.
Flatt, and installed it thus:

raco pkg install profj

The tests worked well, but I could not make profj work in drracket. In
fewer words, I could not define classes and test them in the repl.
Something like that:

class Box {
  int size;
  Box (int s) {
     size = s;}

  int area() {
     return size*size;
 } }


=======

> Box bb= new Box(10);
> bb.area();
100

How can I see profj in all its old glory?
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