{"ast_node_type":"other","tokens":[{"end":38,"kind":"keyword","start":0,"text":"(Ok(_),"}]}
        (Ok(_), Ok(_), Ok(_)) => None,
    let rustup_toolchain_name = match (env::var("CARGO"), env::var("RUSTC"), env::var("RUSTDOC")) {
        (_, Err(_), Err(_)) => Some(rustc_info::get_toolchain_name()),