Function run_stderr 

pub fn run_stderr<P: AsRef<OsStr> + Debug, A: AsRef<OsStr> + Debug>(
    in_directory: &Path,
    cmd: P,
    arguments: &[A],
    set_env: &[(&str, &str)],
    acceptable_status_codes: &[i32],
) -> Result<Outputs<'static>>

Same as run but captures and returns stderr.