require 'benchmark'
require 'rubygems'
require 'active_support'


class X
   
  def return_by_returning    
    returning i = 0 do 
    end
  end
  
  def return_by_return
    i = 0
    return i
  end       
  
  def return_by_omission
    i = 0
    i
  end
  
end                

t = X.new

TESTS = 1_000_000
Benchmark.bmbm do |results|
  results.report("def n; i = 0; return i; end") { TESTS.times { t.return_by_return } }
  results.report("def n; i = 0; i ; end") { TESTS.times { t.return_by_omission } }
  results.report("def n; returning i = 0 do; end; end") { TESTS.times { t.return_by_returning } }
end