error: constant evaluation is taking a long time
  --> $DIR/issue-52475.rs:5:9
   |
LL | /         while n < 5 {
LL | |
LL | |             n = (n + 1) % 5;
LL | |             x = &0; // Materialize a new AllocId
LL | |         }
   | |_________^
   |
   = note: this lint makes sure the compiler doesn't get stuck due to infinite loops in const eval.
           If your compilation actually takes a long time, you can safely allow the lint.
help: the constant being evaluated
  --> $DIR/issue-52475.rs:2:18
   |
LL |       let _ = [(); {
   |  __________________^
LL | |         let mut x = &0;
LL | |         let mut n = 0;
LL | |         while n < 5 {
...  |
LL | |         0
LL | |     }];
   | |_____^
   = note: `#[deny(long_running_const_eval)]` on by default

error: aborting due to 1 previous error