Cannot select Authenticator at runtime

[pkolaczk]

1. Authenticator trait requires Self:Sized, because it is Clone, so it is not possible to have Box<dyn Authenticator>
2. A concrete Authenticator impl type is tied to the Session type.

This means you can't abstract over authenticator in runtime, and e.g. initialize a Session from authentication config known only at runtime and then let all the other code use a single type of a Session.

[pkolaczk]

For a possible solution see this thread: https://users.rust-lang.org/t/why-cant-traits-require-clone/23686