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error: unions cannot have zero fields
--> $DIR/eval-error.rs:14:1
|
LL | union Foo2 {}
| ^^^^^^^^^^^^^
error[E0517]: attribute should be applied to a struct or union
--> $DIR/eval-error.rs:24:12
|
LL | #[repr(u8, packed)]
| ^^^^^^
LL |
LL | / enum Foo3 {
LL | | A
LL | | }
| |_- not a struct or union
error[E0277]: the size for values of type `str` cannot be known at compilation time
--> $DIR/eval-error.rs:2:8
|
LL | a: str,
| ^^^ doesn't have a size known at compile-time
|
= help: the trait `Sized` is not implemented for `str`
= 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: borrowed types always have a statically known size
|
LL | a: &str,
| +
help: the `Box` type always has a statically known size and allocates its contents in the heap
|
LL | a: Box<str>,
| ++++ +
error[E0740]: field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
--> $DIR/eval-error.rs:2:5
|
LL | a: str,
| ^^^^^^
|
= note: union fields must not have drop side-effects, which is currently enforced via either `Copy` or `ManuallyDrop<...>`
help: wrap the field type in `ManuallyDrop<...>`
|
LL | a: std::mem::ManuallyDrop<str>,
| +++++++++++++++++++++++ +
error[E0080]: the type `Foo` has an unknown layout
--> $DIR/eval-error.rs:9:30
|
LL | let _: Option<Foo> = None;
| ^^^^ evaluation of constant value failed
error: aborting due to 5 previous errors
Some errors have detailed explanations: E0080, E0277, E0517, E0740.
For more information about an error, try `rustc --explain E0080`.
|
