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~/Devel/ruby/rubinius$ ./bin/rbx tak.rb 5
      user     system      total        real
  4.536365   0.000000   4.536365 (  4.536341)
  4.528840   0.000000   4.528840 (  4.528901)
  4.514688   0.000000   4.514688 (  4.514683)
  4.870098   0.000000   4.870098 (  4.870177)
  4.518299   0.000000   4.518299 (  4.518370)
~/Devel/ruby/rubinius$ ./bin/rbx -Xrbx.jit tak.rb 5
      user     system      total        real
  3.075275   0.000000   3.075275 (  3.075251)
  3.065969   0.000000   3.065969 (  3.065991)
  3.072245   0.000000   3.072245 (  3.072239)
  3.053712   0.000000   3.053712 (  3.053807)
  3.071791   0.000000   3.071791 (  3.071869)