code: def Concat(self: Iterable, *others):
      
      return concat_generator(self, *[unbox_if_flow(other) for other in others])
docs: [
          {
              'self': [1, 2, 3],
              ':args': [[4, 5, 6], [7, 8, 9]],
              'assert': lambda ret: list(ret) == [1, 2, 3, 4, 5, 6, 7, 8, 9]
           }
      ]