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