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+error[E0277]: the size for values of type `X` cannot be known at compilation time
+ --> $DIR/unsized-trait-impl-trait-arg.rs:8:17
+ |
+LL | impl<X: ?Sized> T2<X> for S4<X> {
+ | - ^^^^^ doesn't have a size known at compile-time
+ | |
+ | this type parameter needs to be `std::marker::Sized`
+ |
+note: required by a bound in `T2`
+ --> $DIR/unsized-trait-impl-trait-arg.rs:4:10
+ |
+LL | trait T2<Z> {
+ | ^ required by this bound in `T2`
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+ |
+LL - impl<X: ?Sized> T2<X> for S4<X> {
+LL + impl<X> T2<X> for S4<X> {
+ |
+help: consider relaxing the implicit `Sized` restriction
+ |
+LL | trait T2<Z: ?Sized> {
+ | ++++++++
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.