1 error[E0277]: the size for values of type `T` cannot be known at compilation time
2 --> $DIR/issue-27060-2.rs:3:11
4 LL | pub struct Bad<T: ?Sized> {
5 | - this type parameter needs to be `std::marker::Sized`
7 | ^ doesn't have a size known at compile-time
9 = help: the trait `std::marker::Sized` is not implemented for `T`
10 = note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
11 = note: the last field of a packed struct may only have a dynamically sized type if it does not need drop to be run
12 = help: change the field's type to have a statically known size
13 help: borrowed types always have a statically known size
17 help: heap allocated types always have a statically known size
22 error: aborting due to previous error
24 For more information about this error, try `rustc --explain E0277`.