{"ast_node_type":"other","tokens":[{"end":125,"kind":"keyword","start":0,"text":"///"}]}
/// <https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts>
/// Supposed to be used for all variables except those set for build scripts by cargo
fn tracked_env_var_os<K: AsRef<OsStr> + Display>(key: K) -> Option<OsString> {