If this is your code in th edef window: 

#lang racket
(define (f x) x)
(set! f f)

you can do this in the REPL: 

Language: racket.
> (f 10)
10
> (set! f (lambda (x) (+ (sqrt x) 20)))
> (f 10)
23.162277660168378
> 


On Aug 6, 2013, at 4:03 PM, Edgar Honing <ephon...@gmail.com> wrote:

> Hi,
> Is it possible to set! other values than a string or a number using the set! 
> dialog in DrRacket while in debug mode? For example: I was wondering whether 
> a procedure value can be reassigned to another procedure/lambda.
> Thanks much,
> Edgar
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