warning: constant evaluation is taking a long time
  --> $DIR/ctfe-simple-loop.rs:10:5
   |
LL | /     while index < n {
...  |
LL | |     }
   | |_____^ the const evaluator is currently interpreting this expression
   |
help: the constant being evaluated
  --> $DIR/ctfe-simple-loop.rs:20:1
   |
LL | const Y: u32 = simple_loop(35);
   | ^^^^^^^^^^^^

warning: 1 warning emitted