docs: def list_of(*generators):
      """
      Generates a list consisting solely of the specified generators.
      This is a class factory, it makes a class which is a closure around the
      specified generators.
      """
  
      class ListOfGenerators(ArbitraryInterface):
          """
          A closure class around the generators specified above, which
          generates a list of the generators.
          """
  
          @classmethod
          def arbitrary(cls):
              """
              Generate a list of the enclosed generators.
              """
              arbitrary_list = []
              for generator in generators:
                  arbitrary_list += [
                      arbitrary(generator)
                      # max_length / len(generators):
                      for _ in range(arbitrary(int) % 100)
                  ]
              return arbitrary_list
  
      ListOfGenerators.__name__ = ''.join([
          'list_of(', ', '.join(generator.__name__ for generator in generators),
          ')'
      ])
      return ListOfGenerators