Method cmp

crates/vm/src/builtins/builtin_func.rs:86–105

(
        zelf: &Py<Self>,
        other: &PyObject,
        op: PyComparisonOp,
        _vm: &VirtualMachine,
    )

// meth_richcompare in CPython
impl Comparable for PyNativeFunction {
    fn cmp(
        zelf: &Py<Self>,
        other: &PyObject,
        op: PyComparisonOp,
        _vm: &VirtualMachine,
    ) -> PyResult<PyComparisonValue> {
        op.eq_only(|| {
            if let Some(other) = other.downcast_ref::<Self>() {
                let eq = match (zelf.zelf.as_ref(), other.zelf.as_ref()) {
                    (Some(z), Some(o)) => z.is(o),
                    (None, None) => true,
                    _ => false,
                };
                let eq = eq && core::ptr::eq(zelf.value, other.value);
                Ok(eq.into())
            } else {
                Ok(PyComparisonValue::NotImplemented)
            }
        })
    }
}

// meth_repr in CPython