src/test/ui/unconstrained-none.stderr

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