[plt-scheme] Collect-Garbage not enabled on Dr. Scheme?

it works in pretty big ,lazy scheme and also FRtime plus it works in PLAI
scheme.
My drscheme version : 4.1.4

On Sat, Apr 4, 2009 at 11:12 PM, dave yrueta <dyrueta at gmail.com> wrote:

> Hi All --
>
> After creating function 'create-tests,' I ran the following per HtDP
> exercise 26.3.6 --
>
> (define test-case (create-tests 10000))
> (collect-garbage)
> (time (sort test-case))
> (collect-garbage)
> (time (quick-sort test-case))
>
> -- which returned this:
>
> collect-garbage: name is not defined, not a parameter, and not a
> primitive name
>
> I tried changing the teaching language to Advanced Student and still
> received the same error message.  Is there something I need to do to
> enable the collect-garbage function?  Also, what does collect-garbage
> do?
>
> Thanks!
>
> Dave Yrueta
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