[racket] prop:procedure and arity

From: Alexander D. Knauth (alexander at knauth.org)
Date: Mon Feb 9 19:36:56 EST 2015

Say I want a struct that will act as a procedure.
For a given instance of that struct, I want the procedure to have a given arity, but I don’t want the procedure to be a field in the struct.
Is there a way to do this without making the procedure a field?

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