src/test/ui/feature-gates/issue-49983-see-issue-0.stderr

   1 error[E0658]: use of unstable library feature 'ptr_internals': use `NonNull` instead and consider `PhantomData<T>` (if you also use `#[may_dangle]`), `Send`, and/or `Sync`
   2   --> $DIR/issue-49983-see-issue-0.rs:4:30
   3    |
   4 LL | #[allow(unused_imports)] use core::ptr::Unique;
   5    |                              ^^^^^^^^^^^^^^^^^
   6    |
   7    = help: add `#![feature(ptr_internals)]` to the crate attributes to enable
   8
   9 error: aborting due to previous error
  10
  11 For more information about this error, try `rustc --explain E0658`.