[racket] check-expect gui mode in Pretty Big language

From: Guillaume Marceau (gmarceau at gmail.com)
Date: Tue Sep 28 13:55:54 EDT 2010

> File a feature request. Kathy may respond but I need to warn you that 'pretty
> big' is just a legacy language.

#lang racket has the same problem. Running this program:

   #lang racket
   (require test-engine/scheme-gui)
   (check-expect 5 6)

shows the results of running the test in a separate window, but the
links are missing. Also, closing the window kills the repl.

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