Function pyo3::ffi::PyVectorcall_Function

pub unsafe fn PyVectorcall_Function(
    callable: *mut PyObject
) -> Option<unsafe extern "C" fn(_: *mut PyObject, _: *const *mut PyObject, _: usize, _: *mut PyObject) -> *mut PyObject>

Available on Py_3_8 and neither PyPy nor GraalPy only.