error[E0658]: SIMD types are experimental and possibly buggy
  --> $DIR/feature-gate-repr-simd.rs:1:1
   |
LL | #[repr(simd)]
   | ^^^^^^^^^^^^^
   |
   = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
   = help: add `#![feature(repr_simd)]` 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   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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]: SIMD types are experimental and possibly buggy
  --> $DIR/feature-gate-repr-simd.rs:6:1
   |
LL | #[repr(simd)]
   | ^^^^^^^^^^^^^
   |
   = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
   = help: add `#![feature(repr_simd)]` 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   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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]: SIMD types are experimental and possibly buggy
  --> $DIR/feature-gate-repr-simd.rs:9:1
   |
LL | #[repr(simd)]
   | ^^^^^^^^^^^^^
   |
   = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
   = help: add `#![feature(repr_simd)]` 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   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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]: SIMD types are experimental and possibly buggy
  --> $DIR/feature-gate-repr-simd.rs:13:1
   |
LL | #[repr(simd)]
   | ^^^^^^^^^^^^^
   |
   = note: see issue #27731 <https://github.com/rust-lang/rust/issues/27731> for more information
   = help: add `#![feature(repr_simd)]` 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   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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[E0566]: conflicting representation hints
  --> $DIR/feature-gate-repr-simd.rs:4:8
   |
LL | #[repr(C)]
   |        ^
LL |
LL | #[repr(simd)]
   |        ^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #68585 <https://github.com/rust-lang/rust/issues/68585>
   = note: `#[deny(conflicting_repr_hints)]` on by default

error[E0517]: attribute should be applied to a struct
  --> $DIR/feature-gate-repr-simd.rs:9:8
   |
LL | #[repr(simd)]
   |        ^^^^
LL |
LL | union U {f: u32}
   | ---------------- not a struct

error[E0517]: attribute should be applied to a struct
  --> $DIR/feature-gate-repr-simd.rs:13:8
   |
LL | #[repr(simd)]
   |        ^^^^
LL |
LL | enum E { X }
   | ------------ not a struct

error: aborting due to 7 previous errors

Some errors have detailed explanations: E0517, E0566, E0658.
For more information about an error, try `rustc --explain E0517`.
Future incompatibility report: Future breakage diagnostic:
error[E0566]: conflicting representation hints
  --> $DIR/feature-gate-repr-simd.rs:4:8
   |
LL | #[repr(C)]
   |        ^
LL |
LL | #[repr(simd)]
   |        ^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #68585 <https://github.com/rust-lang/rust/issues/68585>
   = note: `#[deny(conflicting_repr_hints)]` on by default