[racket] Implementing an generic interface outside of a struct definition

From: Konrad Hinsen (konrad.hinsen at fastmail.net)
Date: Thu Sep 5 10:47:52 EDT 2013

Is it possible to implement a generic interface outside of a struct
definition, i.e.. for a struct that is already defined? I didn't find
anything about this in the documentation.

Konrad.

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