message: Improve doc comment
diff: @@ -113,7 +113,7 @@ fn has_arg_flag(name: &str) -> bool {
  }
  /// Yields all values of command line flag `name` as `Ok(arg)`, and all other arguments except
  -/// the flag as `Err(arg)`.
  +/// the flag as `Err(arg)`. (The flag `name` itself is not yielded at all, only its values are.)
  struct ArgSplitFlagValue<'a, I> {
  args: TakeWhile<I, fn(&String) -> bool>,
  name: &'a str,
  