[racket] method implementation after struct

It seems like the implementation of a generic method must come before
the structure definition:

(struct Protocol (name interfaces)
        #:transparent
        #:methods gen:dumpable
        ((define dump dump-Protocol)))

(define (dump-Protocol p out) ...)

; dump-Protocol: undefined;
;  cannot reference an identifier before its definition

Is this a bug? Just a limitation?

-- 
Anthony Carrico

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