{"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
        let var = adt.variant(idx); // HIR for the duplicate discriminant
    let report = |dis: Discr<'tcx>, idx, err: &mut Diag<'_>| {
        let (span, display_discr) = match var.discr {