{"ast_node_type":"function","tokens":[{"end":64,"kind":"keyword","start":0,"text":"fn"}]}
    fn write_str(&mut self, s: &str) -> Result<(), fmt::Error> {
impl fmt::Write for RawStderr {
        let ret = unsafe { libc::write(libc::STDERR_FILENO, s.as_ptr().cast(), s.len()) };