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