code: def test_varnames_default() -> None:
      def f(x, y=3) -> None:
          pass
  
      assert varnames(f) == (("x",), ("y",))
  
file_path: catboost/contrib/python/pluggy/py3/tests/test_helpers.py
imports: from functools import wraps
  from typing import Any
  from typing import Callable
  from typing import cast
  from typing import TypeVar
  from pluggy._hooks import varnames
  from pluggy._manager import _formatdef
label_desc: Use image node_id 2 for calling a global function with example usage: test_varnames_default() without return types