error[E0658]: references in statics may only refer to immutable values
  --> $DIR/check-static-immutable-mut-slices.rs:3:37
   |
LL | static TEST: &'static mut [isize] = &mut [];
   |                                     ^^^^^^^ statics require immutable values
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/57349
   = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable

error: aborting due to previous error

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