benchmark:
  vm1_gc_short_with_complex_long: |
    def nested_hash h, n
      if n == 0
        ''
      else
        10.times{
          h[Object.new] = nested_hash(h, n-1)
        }
      end
    end

    long_lived = Hash.new
    nested_hash long_lived, 6

    GC.start
    GC.start

    i = 0
    while i<30_000_000 # while loop 1
      a = '' # short-lived String
      b = ''
      c = ''
      d = ''
      e = ''
      f = ''
      i+=1
    end
loop_count: 1