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

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
  --> $DIR/issue-49983-see-issue-0.rs:14:30
   |
LL | #[allow(unused_imports)] use core::ptr::Unique; //~ ERROR use of unstable library feature
   |                              ^^^^^^^^^^^^^^^^^
   |
   = help: add #![feature(ptr_internals)] to the crate attributes to enable

error: aborting due to previous error

For more information about this error, try `rustc --explain E0658`.
don't see issue #0 The unstable-feature attribute requires an issue (neglecting it is E0547), which gets used in the error messages. Unfortunately, there are some cases where "0" is apparently used a placeholder where no issue exists, directing the user to see the (nonexistent) issue #0. (It would have been better to either let `issue` be optional—compare to how issue is an `Option<u32>` in the feature-gate declarations in libsyntax/feature-gate.rs—or actually require that an issue be created.) Rather than endeavoring to change how `#[unstable]` works at this time (given competing contributor and reviewer priorities), this simple patch proposes the less-ambitious solution of just not adding the "(see issue)" note when the number is zero. Resolves #49983. 2018-04-15 13:12:33 -05:00			`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`
			`--> $DIR/issue-49983-see-issue-0.rs:14:30`
			`\|`
			`LL \| #[allow(unused_imports)] use core::ptr::Unique; //~ ERROR use of unstable library feature`
			`\| ^^^^^^^^^^^^^^^^^`
			`\|`
			`= help: add #![feature(ptr_internals)] to the crate attributes to enable`

			`error: aborting due to previous error`

			For more information about this error, try `rustc --explain E0658`.