vfs: avoid passing None to `shutil.rmtree()` for the exception handler Even though the code looks like it will handle it, pytype 2024.10.11 complains. So the simplest thing to do is pass along a no-op function that it would use internally if it was explicitly provided None. The specific error was: /home/mharbison/projects/mercurial/mercurial-devel/mercurial/vfs.py:360:20: error: in rmtree: Function _RmtreeType.__call__ was called with the wrong arguments [wrong-arg-types] Expected: (self, path, ignore_errors, *, dir_fd, onexc: Callable[[Callable, str, Exception], object]) Actually passed: (self, path, ignore_errors, onexc: Optional[Callable[[Any, bytes, Any], Any]]) Attributes of protocol Callable[[Callable, str, Exception], object] are not implemented on None: __call__ return shutil.rmtree( ~~~~~~~~~~~~~~ self.join(path), ignore_errors=ignore_errors, onexc=onexc ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ) ~~~~~~~~~~~~~ Note that it expects a str on the callback. I thought maybe there would be an @overload, and it could handle both. But looking at the code in Python 3.11, they call `os.fsdecode(path)` on some platforms when given bytes, and pass that str to the callback. So adjust the typehint accordingly, and leave a note.