warning: any use of this value will cause an error
  --> $DIR/promoted_errors.rs:13:5
   |
LL |       0 - 1
   |       ^^^^^
   |       |
   |       attempt to compute `0_u32 - 1_u32`, which would overflow
   |       inside `overflow` at $DIR/promoted_errors.rs:13:5
   |       inside `X` at $DIR/promoted_errors.rs:33:29
...
LL | / const X: () = {
LL | |     let _x: &'static u32 = &overflow();
LL | |
LL | |
...  |
LL | |     let _x: &'static i32 = &oob();
LL | | };
   | |__-
   |
note: the lint level is defined here
  --> $DIR/promoted_errors.rs:9:9
   |
LL | #![warn(const_err, arithmetic_overflow, unconditional_panic)]
   |         ^^^^^^^^^
   = 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>

warning: any use of this value will cause an error
  --> $DIR/promoted_errors.rs:33:28
   |
LL | / const X: () = {
LL | |     let _x: &'static u32 = &overflow();
   | |                            ^^^^^^^^^^^ referenced constant has errors
LL | |
LL | |
...  |
LL | |     let _x: &'static i32 = &oob();
LL | | };
   | |__-
   |
   = 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>

warning: 2 warnings emitted