t = Time.now
1_000_000.times { 40.times { break } }
puts 'break %.2f' % (Time.now-t)
t = Time.now
1_000_000.times { begin ; 40.times { break } ; end }
puts 'begin %.2f' % (Time.now-t)
t = Time.now
1_000_000.times { catch(:fu) { 40.times { throw :fu } } }
puts 'catch %.2f' % (Time.now-t)
t = Time.now
1_000_000.times { 40.times { raise } rescue nil }
puts 'raise %.2f' % (Time.now-t)