code: def test_oblique_mercator_losing_gamma():
      crs = CRS(
          "+proj=omerc +lat_0=-36.10360962430914 +lonc=147.0632291727015 "
          "+alpha=-54.78622979612904 +k=1 +x_0=0 +y_0=0 +gamma=-54.78622979612904"
      )
      with pytest.warns(
          UserWarning,
          match="angle from rectified to skew grid parameter lost in conversion to CF",
      ):
          crs.to_cf()
  
imports: import numpy
  import pytest
  from numpy.testing import assert_almost_equal
  from packaging import version
  from pyproj import CRS
  from pyproj.crs import ProjectedCRS
  from pyproj.crs._cf1x8 import _try_list_if_string
  from pyproj.crs.coordinate_operation import LambertAzimuthalEqualAreaConversion, LambertCylindricalEqualAreaConversion, MercatorAConversion, OrthographicConversion, PolarStereographicAConversion, PolarStereographicBConversion, SinusoidalConversion, StereographicConversion, VerticalPerspectiveConversion
  from pyproj.exceptions import CRSError
  from test.conftest import PROJ_GTE_901, PROJ_LOOSE_VERSION
label_desc: Use image node_id 17 for calling a global function with example usage: test_oblique_mercator_losing_gamma() without return types