Tie two dependent values together, such as a nix::Dir with
its nix::dir::Iter<'a> where 'a is tied to the Dir's
lifetime, making it otherwise impossible to return them or
store them in a struct.
Alternatively we could try the 'rental' crate.
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
6ed25cbe3a