error[E0658]: the target feature `avx512bw` is currently unstable (see issue #44839)
  --> $DIR/target-feature-gate.rs:29:18
   |
LL | #[target_feature(enable = "avx512bw")]
   |                  ^^^^^^^^^^^^^^^^^^^
   |
   = help: add #![feature(avx512_target_feature)] to the crate attributes to enable

error: aborting due to previous error

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