Function extract_cls_receiver_trusted 

pub fn extract_cls_receiver_trusted<'a, 'py>(
    slf: &'a Bound<'py, PyAny>,
    holder: &'a mut Option<Bound<'py, PyType>>,
) -> &'a Bound<'py, PyType>

Extracts a cls receiver from a class instance, assuming the correct instance type has been provided.