{"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"//"}]}
        // The #[lang = "start"] item is the program entrypoint, so there are no calls to it in MIR.
        // are handled at the bottom of the loop based on reachability, with one exception.
        // So even if its mode is LocalCopy, we need to treat it like a root.