{"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
            let mut discr = prev_discr.map_or(initial, |d| d.wrap_incr(tcx));
        self.variants().iter_enumerated().map(move |(i, v)| {
            if let VariantDiscr::Explicit(expr_did) = v.discr