code: def test_Bug_2543():
      # Test that it possible to add all values to itself / deepcopy
      # https://github.com/matplotlib/matplotlib/issues/2543
      # We filter warnings at this stage since a number of them are raised
      # for deprecated rcparams as they should. We don't want these in the
      # printed in the test suite.
      with _api.suppress_matplotlib_deprecation_warning():
          with mpl.rc_context():
              _copy = mpl.rcParams.copy()
              for key in _copy:
                  mpl.rcParams[key] = _copy[key]
          with mpl.rc_context():
              copy.deepcopy(mpl.rcParams)
      with pytest.raises(ValueError):
          validate_bool(None)
      with pytest.raises(ValueError):
          with mpl.rc_context():
              mpl.rcParams["svg.fonttype"] = True
  
imports: import copy
  import os
  import subprocess
  import sys
  from unittest import mock
  from cycler import cycler, Cycler
  import pytest
  import matplotlib
  from matplotlib import _api, _c_internal_utils
  import matplotlib.pyplot
  import matplotlib.colors
  import numpy
  from matplotlib.rcsetup import validate_bool, validate_color, validate_colorlist, _validate_color_or_linecolor, validate_cycler, validate_float, validate_fontstretch, validate_fontweight, validate_hatch, validate_hist_bins, validate_int, validate_markevery, validate_stringlist, validate_sketch, _validate_linestyle, _listify_validator
label_desc: Use image node_id 6 for calling a global function with example usage: test_Bug_2543() without return types