| error[E0658]: extern types are experimental | |
| --> $DIR/feature-gate-extern_types.rs:2:5 | |
| | | |
| LL | type T; | |
| | ^^^^^^^ | |
| | | |
| = note: see issue #43467 <https://github.com/rust-lang/rust/issues/43467> for more information | |
| = help: add `#![feature(extern_types)]` to the crate attributes to enable | |
| = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0658`. |