Can someone explain what ... this is supposed to mean?

fn main() {
    let a @ b @ c @ ref mut d;
    a = true;
    d = &mut false;
    b = c; // error[E0381]: used binding `c` isn't initialized -- but WHY?
}

Isn't the @ supposed to own, or reference, the same value?

Why in the world would I even be allowed to do this - in the very first place?

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