Hello,

I'm switching a large introductory class from Chez Scheme to Racket and I
keep running into small surprises.  Here's one: the docs for racket/trace
specifically mention it being a Chez-Scheme-like feature:

   http://docs.racket-lang.org/reference/debugging.html

But the way students usually use tracing in Chez scheme is with the derived
forms "trace-define" "trace-lambda" "trace-let", and these macros are
missing.

Is there any reason these aren't provided?  If not, is the correct thing to
do a pull request against this repo and pkg?

   https://github.com/plt/racket/tree/master/pkgs/trace

Thanks,
  -Ryan
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