[plt-scheme] What is needed to use gensym?

From: Veer (diggerrrrr at gmail.com)
Date: Sun May 25 10:10:06 EDT 2008

The expression (gensym 'a) give me the error "reference to undefined
identifier: gensym" .
Do i need to add some teachpack or something else?
This is in context of exercise 32.1.3  page 472.

I am using  DrScheme, version 372 [3m].


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