[ones_and_zeros]

Ah ok. I don't write Rust either but maybe it'd look like:

  impl State<Running> {
    pub fn next(self, Trigger<Hibernate>) -> State<Hibernate> {
        State { _inner: Hibernate {} }
    }

    pub fn next(self, Trigger<Terminate>) -> State<Terminate> {
        State { _inner: Terminate {} }
    }
  }

[imtringued]

Usually you would just call your functions hibernate() and terminate(). That way you can call hibernate() on State<Running> but not on State<Terminated> or State<Hibernate>.