[plt-scheme] structures and equal?

Hi there,

I am trying to compare two instances of a simple structure for value equality. Thus:

(define-struct location (x y))

(equal? (make-location 0 0) (make-location 0 0))
#f

(eq? (make-location 0 0) (make-location 0 0))
#f

(eqv? (make-location 0 0) (make-location 0 0))
#f

I have searched the PLT docs and was led to believe that equal? should just work. Any  ideas?

Thanks in advance,
-pp
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