Match fill arms postfix

If you have

let a = Some(1);

when you type a.match and complete it, you get

match a {
    Some(_) => {},
    None => {},
}

If you have a custom enum

enum State {
    Blocked,
    Running,
    Stopped,
}

let state = State::Blocked;

typing state.match and completing it gives

match state {
    _ => {},
}

It would be nice if it produced:

match state {
    State::Blocked => todo!(),
    State::Running => todo!(),
    State::Stopped => todo!(),
}

As a note, RA has an assist to automatically fill arms:

Start by locating rust-analyzer's match postfix completion and comparing it with the existing assist that fills match arms. Verify that completing a custom enum such as State produces one todo!() arm for each variant, while preserving the existing behavior for Option.