error[E0658]: inherent associated types are unstable
  --> $DIR/inherent-const-gating.rs:11:18
   |
LL |     let _x: [(); S::N] = todo!();
   |                  ^^^^
   |
   = note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
   = help: add `#![feature(inherent_associated_types)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0658`.