redo.rb

def doit
  yield
end

def do_retry
  doit do
    begin
      puts 'doing'
      yield
      puts 'done'
    rescue
      puts 'redoing'
      redo
      puts 'redone'
    end
  end
end

def test_do_retries(count)
  i = 0
  do_retry do
    fail 'error' if (i += 1) < count
  end
end