I get a method-lookup failure when I try to call, from a method
override, a method defined in the overriding class.  (See attached
program source.)  What do I need to be doing differently for this to work?

Thanks,
Aidan

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#lang racket

(define top-class%
  (class object%
    (super-new)

    (define/public (a-method)
      (displayln "Hello from top class"))))

(define sub-class%
  (class top-class%
    (super-new)

    (define/private (another-method)
      (displayln "Hello from another method"))

    (define/override (a-method)
      (displayln "Hello from sub class")
      (send this another-method))))

(send (new sub-class%) a-method)

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