{"ast_node_type":"function","tokens":[{"end":78,"kind":"keyword","start":0,"text":"fn"}]}
fn tracked_env_var_os<K: AsRef<OsStr> + Display>(key: K) -> Option<OsString> {
/// <https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts>
    println!("cargo:rerun-if-env-changed={key}");