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error[E0277]: the size for values of type `T` cannot be known at compilation time
--> $DIR/union-sized-field.rs:4:12
|
LL | union Foo<T: ?Sized> {
| - this type parameter needs to be `std::marker::Sized`
LL | value: ManuallyDrop<T>,
| ^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
|
= note: required because it appears within the type `ManuallyDrop<T>`
= note: no field of a union may have a dynamically sized type
= help: change the field's type to have a statically known size
help: consider removing the `?Sized` bound to make the type parameter `Sized`
|
LL - union Foo<T: ?Sized> {
LL + union Foo<T> {
|
help: borrowed types always have a statically known size
|
LL | value: &ManuallyDrop<T>,
| +
help: the `Box` type always has a statically known size and allocates its contents in the heap
|
LL | value: Box<ManuallyDrop<T>>,
| ++++ +
error[E0277]: the size for values of type `T` cannot be known at compilation time
--> $DIR/union-sized-field.rs:9:12
|
LL | struct Foo2<T: ?Sized> {
| - this type parameter needs to be `std::marker::Sized`
LL | value: ManuallyDrop<T>,
| ^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
|
= note: required because it appears within the type `ManuallyDrop<T>`
= note: only the last field of a struct may have a dynamically sized type
= help: change the field's type to have a statically known size
help: consider removing the `?Sized` bound to make the type parameter `Sized`
|
LL - struct Foo2<T: ?Sized> {
LL + struct Foo2<T> {
|
help: borrowed types always have a statically known size
|
LL | value: &ManuallyDrop<T>,
| +
help: the `Box` type always has a statically known size and allocates its contents in the heap
|
LL | value: Box<ManuallyDrop<T>>,
| ++++ +
error[E0277]: the size for values of type `T` cannot be known at compilation time
--> $DIR/union-sized-field.rs:15:11
|
LL | enum Foo3<T: ?Sized> {
| - this type parameter needs to be `std::marker::Sized`
LL | Value(ManuallyDrop<T>),
| ^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
|
= note: required because it appears within the type `ManuallyDrop<T>`
= note: no field of an enum variant may have a dynamically sized type
= help: change the field's type to have a statically known size
help: consider removing the `?Sized` bound to make the type parameter `Sized`
|
LL - enum Foo3<T: ?Sized> {
LL + enum Foo3<T> {
|
help: borrowed types always have a statically known size
|
LL | Value(&ManuallyDrop<T>),
| +
help: the `Box` type always has a statically known size and allocates its contents in the heap
|
LL | Value(Box<ManuallyDrop<T>>),
| ++++ +
error: aborting due to 3 previous errors
For more information about this error, try `rustc --explain E0277`.
|
