old_contents: def test_cxx_import():
      from microscopes.mixture.model import \
          state, fixed_state, \
          bind, bind_fixed, \
          initialize, initialize_fixed, \
          deserialize, deserialize_fixed
      assert state and fixed_state
      assert bind and bind_fixed
      assert initialize and initialize_fixed
      assert deserialize and deserialize_fixed
  
new_contents: def test_cxx_import():
      from microscopes.mixture.model import \
          state, \
          bind, \
          initialize, \
          deserialize
      assert state
      assert bind
      assert initialize
      assert deserialize
  
subject: Remove fixed references from test_cxx.py