You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: benchmark.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/lib
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
#--
# benchmark.rb - a performance benchmarking library
#
# $Id$
#
# Created by Gotoken (gotoken@notwork.org).
#
# Docum
    
  def bmbm(width = 0) # :yield: job
    job = Job.new(width)
    yield(job)
    width = job.width + 1
    sync = $stdout.sync
    $stdout.sync = true

    # rehearsal
    puts 'Rehearsal '.ljust(width+CAPTION.length,'-')
    ets = job.list.inject(Tms.new) { |sum,(label,item)|
      print label.ljust(width)
      res = Benchmark.measure(&item)
      print res.format
      sum + res
    }.format("total: %tsec")
    print " #{ets}\n\n".rjust(width+CAPTION.length+2,'-')

    # take
    print ' '*width + CAPTION
    job.list.map { |label,item|
      GC.start
      print label.ljust(width)
      Benchmark.measure(label, &item).tap { |res| print res }
    }
  ensure
    $stdout.sync = sync unless sync.nil?
  end