{"ast_node_type":"variable","tokens":[{"end":55,"kind":"keyword","start":0,"text":"let"}]}
    let rust_dir: Option<&Path> = Some(&rust_dir_path);
    let _ = git_clone("https://github.com/rust-lang/rust.git", Some(&rust_dir_path), false);
    run_command(&[&"git", &"checkout", &"--", &"tests/"], rust_dir)?;