1error[E0282]: type annotations needed
2  --> $DIR/unconstrained-ref.rs:6:5
3   |
4LL |     S { o: &None };
5   |     ^ cannot infer type for type parameter `T` declared on the struct `S`
6
7error: aborting due to previous error
8
9For more information about this error, try `rustc --explain E0282`.
10