Method cmp

crates/vm/src/builtins/weakref.rs:120–135

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

impl Comparable for PyWeak {
    fn cmp(
        zelf: &Py<Self>,
        other: &PyObject,
        op: PyComparisonOp,
        vm: &VirtualMachine,
    ) -> PyResult<crate::function::PyComparisonValue> {
        op.eq_only(|| {
            let other = class_or_notimplemented!(Self, other);
            let both = zelf.upgrade().and_then(|s| other.upgrade().map(|o| (s, o)));
            let eq = match both {
                Some((a, b)) => vm.bool_eq(&a, &b)?,
                None => zelf.is(other),
            };
            Ok(eq.into())
        })
    }
}

impl Representable for PyWeak {