{"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
        let src = SourceRootConfig { fsc, local_filesets: vec![0, 1, 2, 3] };
        let fsc = builder.build();
        let mut vc = src.source_root_parent_map().into_iter().collect::<Vec<_>>();