{"ast_node_type":"other","tokens":[{"end":58,"kind":"keyword","start":0,"text":"self.source_map.lifetime_map_back.insert(id,"}]}
        self.source_map.lifetime_map_back.insert(id, ptr);
        let ptr = self.expander.in_file(node);
        self.source_map.lifetime_map.insert(ptr, id);