error[E0277]: the trait bound `<<<Bar as Foo>::SignatureCurve as ecdsa::elliptic_curve::Curve>::FieldBytesSize as Add>::Output: ArrayLength<u8>` is not satisfied
  --> src/main.rs:25:10
   |
25 |     Bar: Foo,
   |          ^^^ the trait `ArrayLength<u8>` is not implemented for `<<<Bar as Foo>::SignatureCurve as ecdsa::elliptic_curve::Curve>::FieldBytesSize as Add>::Output`
   |