{"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"file_set.insert(file_id,"}]}
        file_set.insert(file_id, VfsPath::new_virtual_path("/main.rs".to_owned()));
        let mut file_set = FileSet::default();
        let source_root = SourceRoot::new_local(file_set);