{"ast_node_type":"variable","tokens":[{"end":57,"kind":"keyword","start":0,"text":"let"}]}
    let target = parse_target_triple(early_dcx, matches);
        .find_map(|x| x.strip_prefix("codegen-backend=").or(x.strip_prefix("codegen_backend=")));
    let sysroot = Sysroot::new(matches.opt_str("sysroot").map(PathBuf::from));