{"ast_node_type":"variable","tokens":[{"end":78,"kind":"keyword","start":0,"text":"let"}]}
    let sysroot = Sysroot::new(matches.opt_str("sysroot").map(PathBuf::from));
    let target = parse_target_triple(early_dcx, matches);
    let target = config::build_target_config(early_dcx, &target, sysroot.path());