message: Remove code duplication
  The only difference was between `pub(crate)` and private, so probably
  not worth it.
diff: @@ -87,9 +87,7 @@ impl<'a> S3Backend<'a> {
  }
  }
  -#[cfg(not(test))]
  -const TIME_FMT: &str = "%a, %d %b %Y %H:%M:%S %Z";
  -#[cfg(test)]
  +// public for testing
  pub(crate) const TIME_FMT: &str = "%a, %d %b %Y %H:%M:%S %Z";
  fn parse_timespec(raw: &str) -> Result<Timespec, Error> {
  