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 len is 3 but the index is 5
   |
   = note: `#[deny(const_err)]` on by default

error: aborting due to previous error