Function _PyObject_VectorcallTstate 

pub unsafe fn _PyObject_VectorcallTstate(
    tstate: *mut PyThreadState,
    callable: *mut PyObject,
    args: *const *mut PyObject,
    nargsf: usize,
    kwnames: *mut PyObject,
) -> *mut PyObject

Available on Py_3_8 and crate feature tls and non-PyPy only.