code: def container(self, name, length, type, *parameters):
          
          self.new_struct('Container', name, 'length=%s' % length)
          BuiltIn().run_keyword(type, *parameters)
          self.end_struct()
docs: Define a container with given length.
  
          This is a convenience method creating a `Struct` with `length` containing fields defined in `type`.