error[E0277]: the trait bound `i32: Foo` is not satisfied
  --> $DIR/associated-const-array-len.rs:5:17
   |
LL | const X: [i32; <i32 as Foo>::ID] = [0, 1, 2];
   |                 ^^^ the trait `Foo` is not implemented for `i32`
   |
help: this trait has no implementations, consider adding one
  --> $DIR/associated-const-array-len.rs:1:1
   |
LL | trait Foo {
   | ^^^^^^^^^

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.