code: def test_failing_latex():
      """Test failing latex subprocess call"""
      plt.xlabel(
          "$22_2_2$", usetex=True
      )  # This fails with "Double subscript"
      with pytest.raises(RuntimeError):
          plt.savefig(io.BytesIO(), format="pdf")
  
imports: import datetime
  import decimal
  import io
  import os
  from pathlib import Path
  import numpy
  import pytest
  import matplotlib
  from matplotlib import pyplot, rcParams, font_manager
  from matplotlib.cbook import _get_data_path
  from matplotlib.ft2font import FT2Font
  from matplotlib.font_manager import findfont, FontProperties
  from matplotlib.backends._backend_pdf_ps import get_glyphs_subset
  from matplotlib.backends.backend_pdf import PdfPages
  from matplotlib.patches import Rectangle
  from matplotlib.testing.decorators import check_figures_equal, image_comparison
  from matplotlib.testing._markers import needs_usetex
label_desc: Use image node_id 18 for calling a global function with example usage: test_failing_latex() without return types