| error[E0282]: type annotations needed | |
| --> $DIR/unconstrained-none.rs:14:5 | |
| | | |
| LL | None; //~ ERROR type annotations needed [E0282] | |
| | ^^^^ cannot infer type for `T` | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0282`. |