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error[E0038]: the trait `B` cannot be made into an object
--> $DIR/issue-38404.rs:3:15
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LL | trait C<T>: A<dyn B<T, Output=usize>> {}
| ^^^^^^^^^^^^^^^^^^^^^^ `B` cannot be made into an object
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note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
--> $DIR/issue-38404.rs:1:13
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LL | trait A<T>: std::ops::Add<Self> + Sized {}
| ^^^^^^^^^^^^^^^^^^^ ...because it uses `Self` as a type parameter
LL | trait B<T>: A<T> {}
| - this trait cannot be made into an object...
error: aborting due to previous error
For more information about this error, try `rustc --explain E0038`.
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