{"ast_node_type":"variable","tokens":[{"end":32,"kind":"keyword","start":0,"text":"let"}]}
        let eligible_for_merge =
    fn merge_if_eligible(&mut self, other: &Self) -> bool {
            |a: &Self, b: &Self| (a.bcb == b.bcb) && a.span.overlaps_or_adjacent(b.span);