1 error[E0277]: the size for values of type `X` cannot be known at compilation time
2 --> $DIR/unsized7.rs:12:21
5 | - required by this bound in `T1`
7 LL | impl<X: ?Sized + T> T1<X> for S3<X> {
8 | - ^^^^^ doesn't have a size known at compile-time
10 | this type parameter needs to be `std::marker::Sized`
12 help: consider relaxing the implicit `Sized` restriction
14 LL | trait T1<Z: T + ?Sized> {
17 error: aborting due to previous error
19 For more information about this error, try `rustc --explain E0277`.