Method delete

crates/stdlib/src/contextvars.rs:327–341

(zelf: &Py<Self>, vm: &VirtualMachine)

    impl ContextVar {
        fn delete(zelf: &Py<Self>, vm: &VirtualMachine) -> PyResult<()> {
            zelf.cached.store(None);

            let ctx = PyContext::current(vm);

            let mut vars = ctx.borrow_vars_mut();
            if vars.swap_remove(zelf).is_none() {
                // TODO:
                // PyErr_SetObject(PyExc_LookupError, (PyObject *)var);
                let msg = zelf.as_object().repr(vm)?.as_wtf8().to_owned();
                return Err(vm.new_lookup_error(msg));
            }

            Ok(())
        }

        // contextvar_set in CPython
        fn set_inner(zelf: &Py<Self>, value: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {