Edit: Mine has a minor bug: The conditional in eat should be inside
the same dosync as the result, so it should be:

(if (not (dosync (let [first-fork @(nth...) second-fork @(nth...)]
            (if (and first-fork second-fork)
                (do (ref-set ...) (ref-set ...)))
          (and first-fork second-fork)))
  (eat i))

Where the unchanged code is elided. Sorry about the confusion, if
there was any. This actually fixes the even subtler nested dosync
problem, which should have led to a degradation in concurrency, but I
couldn't see it in the printout.

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