message: annotated use of trim_left fn with allow deprecated macro
diff: @@ -290,6 +290,7 @@ trait HeaderReader: BufRead {
  "Only ascii characters allowed in pam header".to_string(),
  ));
  }
  + #[allow(deprecated)]
  let (identifier, rest) = line.trim_left()
  .split_at(line.find(char::is_whitespace).unwrap_or_else(|| line.len()));
  match identifier {
  