warning: the feature `unsized_const_params` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/regions-in-canonical.rs:3:30
   |
LL | #![feature(adt_const_params, unsized_const_params)]
   |                              ^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #95174 <https://github.com/rust-lang/rust/issues/95174> for more information
   = note: `#[warn(incomplete_features)]` on by default

warning: 1 warning emitted