|  | error[E0658]: `unsafe` fields are experimental | 
|  | --> $DIR/feature-gate-unsafe_fields.rs:9:5 | 
|  | | | 
|  | LL |     unsafe field: (), | 
|  | |     ^^^^^^ | 
|  | | | 
|  | = note: see issue #132922 <https://github.com/rust-lang/rust/issues/132922> for more information | 
|  | = help: add `#![feature(unsafe_fields)]` 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|  | = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date | 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[E0658]: `unsafe` fields are experimental | 
|  | --> $DIR/feature-gate-unsafe_fields.rs:17:15 | 
|  | | | 
|  | LL |     Variant { unsafe field: () }, | 
|  | |               ^^^^^^ | 
|  | | | 
|  | = note: see issue #132922 <https://github.com/rust-lang/rust/issues/132922> for more information | 
|  | = help: add `#![feature(unsafe_fields)]` 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|  | = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date | 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[E0658]: `unsafe` fields are experimental | 
|  | --> $DIR/feature-gate-unsafe_fields.rs:24:5 | 
|  | | | 
|  | LL |     unsafe field: (), | 
|  | |     ^^^^^^ | 
|  | | | 
|  | = note: see issue #132922 <https://github.com/rust-lang/rust/issues/132922> for more information | 
|  | = help: add `#![feature(unsafe_fields)]` 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|  | = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date | 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 3 previous errors | 
|  |  | 
|  | For more information about this error, try `rustc --explain E0658`. |