Comment by bonzini

"Some(...)" means that this Option<T> does have a value of type T in it; "None" means it doesn't.

"q.0" is not really needed, it's a struct with unnamed fields. Here is the same with named fields:

  struct Q<T: 'static> { pub x: Option<T> }
  ...
  let l = String::new();
  let mut q = Q { x: None };
  q.x = Some(&l);