I'd like to have a struct which references another with the reference being a field member. The struct doesn't own the data it's referring to, and the data can be non-existent. Is this the only way of expressing what I'm after?

pub struct MyStruct {
    pub data: Weak<Option<RefCell<Data>>>
}

The lifetime of the data member should always at least match the struct in scenarios where it's needed, so maybe just a regular Option<&'a mut Data> could work? In that case, how would I get a &Data out of the option if necessary? Sometimes I want the data not to be mut.

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