28     class hgpathentryfinder(importlib.abc.MetaPathFinder):

    28     class hgpathentryfinder(importlib.abc.MetaPathFinder):

    29         """A sys.meta_path finder that uses a custom module loader."""

    29         """A sys.meta_path finder that uses a custom module loader."""

    30         def find_spec(self, fullname, path, target=None):

    30         def find_spec(self, fullname, path, target=None):

    31             # Only handle Mercurial-related modules.

    31             # Only handle Mercurial-related modules.

    32             if not fullname.startswith(('mercurial.', 'hgext.', 'hgext3rd.')):

    32             if not fullname.startswith(('mercurial.', 'hgext.', 'hgext3rd.')):

    33                 return None

    36                 return None

    34             # third-party packages are expected to be dual-version clean

    37             # third-party packages are expected to be dual-version clean

    35             if fullname.startswith('mercurial.thirdparty'):

    38             if fullname.startswith('mercurial.thirdparty'):

    36                 return None

    39                 return None

    37             # zstd is already dual-version clean, don't try and mangle it

    40             # zstd is already dual-version clean, don't try and mangle it