1 error[E0038]: the trait `B` cannot be made into an object
2 --> $DIR/issue-38404.rs:3:15
4 LL | trait A<T>: std::ops::Add<Self> + Sized {}
5 | ------------------- ...because it uses `Self` as a type parameter in this
6 LL | trait B<T>: A<T> {}
7 | - this trait cannot be made into an object...
8 LL | trait C<T>: A<dyn B<T, Output=usize>> {}
9 | ^^^^^^^^^^^^^^^^^^^^^^ the trait `B` cannot be made into an object
11 error: aborting due to previous error
13 For more information about this error, try `rustc --explain E0038`.