error[E0277]: the size for values of type `[u8]` cannot be known at compilation time --> $DIR/box-into-boxed-slice-fail.rs:8:35 | LL | let _ = Box::into_boxed_slice(boxed_slice); | ^^^^^^^^^^^ doesn't have a size known at compile-time | = help: the trait `std::marker::Sized` is not implemented for `[u8]` = note: to learn more, visit = note: required by `std::boxed::Box::::into_boxed_slice` error[E0277]: the size for values of type `[u8]` cannot be known at compilation time --> $DIR/box-into-boxed-slice-fail.rs:8:13 | LL | let _ = Box::into_boxed_slice(boxed_slice); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time | = help: the trait `std::marker::Sized` is not implemented for `[u8]` = note: to learn more, visit = note: slice and array elements must have `Sized` type error[E0277]: the size for values of type `dyn std::fmt::Debug` cannot be known at compilation time --> $DIR/box-into-boxed-slice-fail.rs:12:35 | LL | let _ = Box::into_boxed_slice(boxed_trait); | ^^^^^^^^^^^ doesn't have a size known at compile-time | = help: the trait `std::marker::Sized` is not implemented for `dyn std::fmt::Debug` = note: to learn more, visit = note: required by `std::boxed::Box::::into_boxed_slice` error[E0277]: the size for values of type `dyn std::fmt::Debug` cannot be known at compilation time --> $DIR/box-into-boxed-slice-fail.rs:12:13 | LL | let _ = Box::into_boxed_slice(boxed_trait); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time | = help: the trait `std::marker::Sized` is not implemented for `dyn std::fmt::Debug` = note: to learn more, visit = note: slice and array elements must have `Sized` type error: aborting due to 4 previous errors For more information about this error, try `rustc --explain E0277`.