Method add_note

crates/vm/src/exceptions.rs:687–707

(self, note: PyStrRef, vm: &VirtualMachine)

    #[pymethod]
    fn add_note(self, note: PyStrRef, vm: &VirtualMachine) -> PyResult<()> {
        let dict = self
            .as_object()
            .dict()
            .ok_or_else(|| vm.new_attribute_error("Exception object has no __dict__"))?;

        let notes = if let Ok(notes) = dict.get_item("__notes__", vm) {
            notes
        } else {
            let new_notes = vm.ctx.new_list(vec![]);
            dict.set_item("__notes__", new_notes.clone().into(), vm)?;
            new_notes.into()
        };

        let notes = notes
            .downcast::<PyList>()
            .map_err(|_| vm.new_type_error("__notes__ must be a list"))?;

        notes.borrow_vec_mut().push(note.into());
        Ok(())
    }

    #[pymethod]
    fn __reduce__(self, vm: &VirtualMachine) -> PyTupleRef {