I have the following problem. I want to replace procedure gensym with a 
mock
to test a piece of software with predictable gensym values. When this is 
done, 
I restore the old gensym.
Thus I wrote this code in racket:

(define old-gensym gensym)
(define gensym <a mock ...>)
...test...
(define gensym old-gensym)

but when I run it, I get "reference to an identifier before its 
definition: gensym".
On the other hand, if I write the same code in the interaction window, 
everything works as expected.

Is this a bug?

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