pub fn parse_der_tagged_implicit_g<'a, IntoTag, T, F, E>(
    tag: IntoTag,
    f: F
) -> impl FnMut(&'a [u8])
where F: Fn(&'a [u8], Tag, Header<'a>) -> Result<(&'a [u8], T), Err<E>>, E: ParseError<&'a [u8]> + From<Error>, IntoTag: Into<Tag>, T: Tagged,
Available on crate feature mtls only.