{"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"build_cmd.arg(format!(\"-Zroot-dir={}\","}]}
    build_cmd.arg(format!("-Zroot-dir={}", STDLIB_SRC.to_path(dirs).display()));
    build_cmd.arg("--features").arg("backtrace panic-unwind");
    build_cmd.env("CARGO_PROFILE_RELEASE_DEBUG", "true");