[racket] writing garbage collector in racket/scheme?

Hi all -

I have a rather curious question - is it possible to write a garbage
collector in a pointerless language such as racket/scheme?

This is not about whether one should do such a thing, but rather trying to
see whether it is possible at all, and if possible what steps/approaches it
will look like.  I am wondering if this is one of the problems that needs to
live outside of racket/scheme environment.

Any thoughts/idea are appreciated.  Thanks,
yc
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