{"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
        let (variant_index, variant_dest, active_field_index) = match *kind {
        self.write_uninit(dest)?; // make sure all the padding ends up as uninit
            mir::AggregateKind::Adt(_, variant_index, _, _, active_field_index) => {