mirror of
https://github.com/rust-lang/rust
synced 2024-11-05 20:45:15 +00:00
42 lines
1.7 KiB
Text
42 lines
1.7 KiB
Text
error[E0277]: the size for values of type `Self` cannot be known at compilation time
|
|
--> $DIR/object-safety-supertrait-mentions-Self.rs:8:13
|
|
|
|
|
LL | trait Baz : Bar<Self> {
|
|
| ^^^^^^^^^ doesn't have a size known at compile-time
|
|
|
|
|
note: required by an implicit `Sized` bound in `Bar`
|
|
--> $DIR/object-safety-supertrait-mentions-Self.rs:4:11
|
|
|
|
|
LL | trait Bar<T> {
|
|
| ^ required by the implicit `Sized` requirement on this type parameter in `Bar`
|
|
help: consider further restricting `Self`
|
|
|
|
|
LL | trait Baz : Bar<Self> + Sized {
|
|
| +++++++
|
|
help: consider relaxing the implicit `Sized` restriction
|
|
|
|
|
LL | trait Bar<T: ?Sized> {
|
|
| ++++++++
|
|
|
|
error[E0038]: the trait `Baz` cannot be made into an object
|
|
--> $DIR/object-safety-supertrait-mentions-Self.rs:16:31
|
|
|
|
|
LL | fn make_baz<T:Baz>(t: &T) -> &dyn Baz {
|
|
| ^^^^^^^ `Baz` cannot be made into an object
|
|
|
|
|
note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
|
|
--> $DIR/object-safety-supertrait-mentions-Self.rs:8:13
|
|
|
|
|
LL | trait Baz : Bar<Self> {
|
|
| --- ^^^^^^^^^ ...because it uses `Self` as a type parameter
|
|
| |
|
|
| this trait cannot be made into an object...
|
|
help: consider using an opaque type instead
|
|
|
|
|
LL | fn make_baz<T:Baz>(t: &T) -> &impl Baz {
|
|
| ~~~~
|
|
|
|
error: aborting due to 2 previous errors
|
|
|
|
Some errors have detailed explanations: E0038, E0277.
|
|
For more information about an error, try `rustc --explain E0038`.
|