1 error[E0277]: the size for values of type `X` cannot be known at compilation time
2 --> $DIR/unsized-trait-impl-trait-arg.rs:8:17
5 | - required by this bound in `T2`
7 LL | impl<X: ?Sized> T2<X> for S4<X> {
8 | - ^^^^^ doesn't have a size known at compile-time
10 | this type parameter needs to be `std::marker::Sized`
12 help: consider removing the `?Sized` bound to make the type parameter `Sized`
14 LL | impl<X> T2<X> for S4<X> {
16 help: consider relaxing the implicit `Sized` restriction
18 LL | trait T2<Z: ?Sized> {
21 error: aborting due to previous error
23 For more information about this error, try `rustc --explain E0277`.