error[E0723]: loops are not allowed in const fn (see issue #57563)
  --> $DIR/loop_ice.rs:2:5
   |
LL |     loop {} //~ ERROR loops are not allowed in const fn
   |     ^^^^^^^
   |
   = help: add #![feature(const_fn)] to the crate attributes to enable

error: aborting due to previous error

For more information about this error, try `rustc --explain E0723`.