{"ast_node_type":"variable","tokens":[{"end":92,"kind":"keyword","start":0,"text":"let"}]}
    let _ = git_clone("https://github.com/rust-lang/rust.git", Some(&rust_dir_path), false);
    // If the repository was already cloned, command will fail, so doesn't matter.
    let rust_dir: Option<&Path> = Some(&rust_dir_path);