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JRuby
                                              user     system      total        real
control, 1m while loop                    0.052000   0.000000   0.052000 (  0.051715)
near closure, 1m x10 a,a=a,a              0.067000   0.000000   0.067000 (  0.066145)
in closure, 1m x10 a,a=a,a                0.055000   0.000000   0.055000 (  0.055218)
near closure, 5 vars, 1m * x10 a,a=a,a    0.053000   0.000000   0.053000 (  0.053874)
in closure, 5 vars, 1m x10 a,a=a,a        0.088000   0.000000   0.088000 (  0.087766)
normal heapless, 1m x 100 a,a=a,a         0.051000   0.000000   0.051000 (  0.051018)
normal heapless, 1m x 100 10-var masgn    0.052000   0.000000   0.052000 (  0.051562)

MRI
                                              user     system      total        real
control, 1m while loop                    3.700000   0.010000   3.710000 (  3.741019)
near closure, 1m x10 a,a=a,a              3.710000   0.010000   3.720000 (  3.776421)
in closure, 1m x10 a,a=a,a                3.770000   0.020000   3.790000 (  3.843328)
near closure, 5 vars, 1m * x10 a,a=a,a    3.740000   0.020000   3.760000 (  3.815184)
in closure, 5 vars, 1m x10 a,a=a,a        3.760000   0.010000   3.770000 (  3.862280)
normal heapless, 1m x 100 a,a=a,a         3.740000   0.020000   3.760000 (  3.840524)
normal heapless, 1m x 100 10-var masgn    3.730000   0.020000   3.750000 (  3.954526)