How do I mutably assign with `ref mut` pattern?

help
1 
let mut opt = Some(1);
if let Some(mut inner) = opt.as_mut() {
    *inner = 2;
    let mut other_usize = 3;
    inner = &mut other_usize;
    *inner = 4;
}

The type of inner is mut &mut usize.
How do I use ref mut to achieve the same thing?

2

mut ref mut is tentatively planned for edition 2024 but not yet stable, or, apparently, complete.

In the meanwhile you can rebind after the pattern matching.

(Or just use binding modes like in the OP.)

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