[racket] Why does rackunit show the stack trace of check failures?

From: Eric Dobson (eric.n.dobson at gmail.com)
Date: Tue Oct 8 23:41:16 EDT 2013

I'm trying to clean up the output of some test cases so they are
easier to debug when the go wrong. One of the issues is that the
rackunit text ui always wants to print the stack trace of check
failures. I never find these useful since they just show frames of the
test code, not the code under test.

The code is here:
Added here:

It is guarded by a (when #t ...), could we change it so that is
instead a (when verbose? ...)? verbose? is already affecting other
parts of the output in this function.

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