{"ast_node_type":"variable","tokens":[{"end":75,"kind":"keyword","start":0,"text":"let"}]}
        let id = *self.phys_counter_for_node.entry(bcb).or_insert_with(|| {
    fn ensure_phys_counter(&mut self, bcb: BasicCoverageBlock) -> CovTerm {
            let id = self.next_counter_id;