error[E0046]: not all trait items implemented, missing: `N`
  --> $DIR/issue-98629.rs:8:1
   |
LL |     const N: usize;
   |     -------------- `N` from trait
...
LL | impl const Trait for i32 {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^ missing `N` in implementation

error: aborting due to previous error

For more information about this error, try `rustc --explain E0046`.