{"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
                    let is_niche = if tag_range.no_unsigned_wraparound(tag_size) == Ok(true) {
                    let cast_tag = bx.intcast(relative_discr, cast_to, false);
                        if niche_start == tag_range.start {