error[E0308]: mismatched types
  --> $DIR/const-in-trait-fn-return-type.rs:8:40
   |
LL |     fn func<const N: u32>() -> [ (); { () }] {
   |                                        ^^ expected `usize`, found `()`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.