message: Add explicit lifetimes, just in case
diff: @@ -98,7 +98,7 @@ impl SymKey {
  }
  /// You really don't want to use this.
  - pub fn as_bytes(&self) -> Res<&[u8]> {
  + pub fn as_bytes<'a>(&'a self) -> Res<&'a [u8]> {
  let rv = unsafe { PK11_ExtractKeyValue(self.ptr) };
  result::result(rv)?;
  