{"ast_node_type":"variable","tokens":[{"end":68,"kind":"keyword","start":0,"text":"let"}]}
        let sm = Arc::new(SourceMap::new(FilePathMapping::empty()));
    rustc_span::create_default_session_globals_then(|| {
        sm.new_source_file(Path::new("test.rs").to_owned().into(), code.to_owned());