code: def test_packed_function() -> None:
      ifunc = base.ExperimentFunction(
          _Callable(), ng.p.Scalar(1).set_name("")
      )
      with pytest.raises(AssertionError):
          base.MultiExperiment([ifunc, ifunc], [100, 100])
      pfunc = base.MultiExperiment([ifunc, ifunc.copy()], [100, 100])
      np.testing.assert_equal(
          pfunc.descriptors["name"], "_Callable,_Callable"
      )
      np.testing.assert_array_equal(pfunc(-3), [3, 3])
  
imports: import pickle
  import numpy
  import pytest
  import nevergrad
  from nevergrad.common import testing
  from nevergrad.functions import ArtificialFunction
  import nevergrad.common.typing
  from .None import base
  from .None import helpers
label_desc: Use image node_id 6 for calling a global function with example usage: test_packed_function() without return types