error: any use of this value will cause an error
  --> $DIR/const_eval_limit_reached.rs:6:11
   |
LL | const X: usize = {
   | --------------
LL |     let mut x = 0;
LL |     while x != 1000 {
   |           ^^^^^^^^^ exceeded interpreter step limit (see `#[const_eval_limit]`)
   |
   = 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

Future incompatibility report: Future breakage diagnostic:
error: any use of this value will cause an error
  --> $DIR/const_eval_limit_reached.rs:6:11
   |
LL | const X: usize = {
   | --------------
LL |     let mut x = 0;
LL |     while x != 1000 {
   |           ^^^^^^^^^ exceeded interpreter step limit (see `#[const_eval_limit]`)
   |
   = 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>