{"ast_node_type":"function","tokens":[{"end":75,"kind":"keyword","start":0,"text":"fn"}]}
    fn ensure_phys_counter(&mut self, bcb: BasicCoverageBlock) -> CovTerm {
    /// Returns the physical counter for the given node, creating it if necessary.
        let id = *self.phys_counter_for_node.entry(bcb).or_insert_with(|| {