error: any use of this value will cause an error
  --> $DIR/const-slice-oob.rs:4:18
   |
LL | const BAR: u32 = FOO[5];
   | -----------------^^^^^^-
   |                  |
   |                  index out of bounds: the length is 3 but the index is 5
   |
   = note: `#[deny(const_err)]` on by default
   = 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 #71800 <https://github.com/rust-lang/rust/issues/71800>

error: aborting due to previous error