class RSpec::Core::Backports::Random::MT19937

def next_state

Generates a completely new state out of the previous one. 
def next_state
  STATE_SIZE.times do |i|
    mix = @state[i] & 0x80000000 | @state[i+1 - STATE_SIZE] & 0x7fffffff
    @state[i] = @state[i+OFFSET - STATE_SIZE] ^ (mix >> 1)
    @state[i] ^= 0x9908b0df if mix.odd?
  end
  @last_read = -1
end