src/test/ui/issues/issue-6458-2.stderr

error[E0282]: type annotations needed
  --> $DIR/issue-6458-2.rs:13:21
   |
LL |     format!("{:?}", None);
   |                     ^^^^ cannot infer type for `T`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0282`.