error[E0275]: overflow evaluating the requirement `<Number<T> as Foo>::Item == _`
  --> $DIR/projection-bound-cycle-generic.rs:23:5
   |
LL |     type Item = [T] where [T]: Sized;
   |     ^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0275`.