{"ast_node_type":"variable","tokens":[{"end":61,"kind":"keyword","start":0,"text":"let"}]}
    let (db, file_ids) = TestDB::with_many_files(ra_fixture);
fn check_panic(#[rust_analyzer::rust_fixture] ra_fixture: &str, expected_panic: &str) {
    let file_id = *file_ids.last().unwrap();