8c04999226
When we encounter a `dyn Trait` that isn't object safe, look for its
implementors. If there's one, mention using it directly If there are
less than 9, mention the possibility of creating a new enum and using
that instead.
Account for object unsafe `impl Trait on dyn Trait {}`. Make a
distinction between public and sealed traits.
Fix #80194.
52 lines
2.4 KiB
Plaintext
52 lines
2.4 KiB
Plaintext
error[E0038]: the trait `Trait` cannot be made into an object
|
|
--> $DIR/wf-convert-unsafe-trait-obj.rs:16:25
|
|
|
|
|
LL | let t: &dyn Trait = &S;
|
|
| ^^ `Trait` 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/wf-convert-unsafe-trait-obj.rs:6:14
|
|
|
|
|
LL | trait Trait: Sized {}
|
|
| ----- ^^^^^ ...because it requires `Self: Sized`
|
|
| |
|
|
| this trait cannot be made into an object...
|
|
= help: only type `S` implements the trait, consider using it directly instead
|
|
= note: required for the cast from `&S` to `&dyn Trait`
|
|
|
|
error[E0038]: the trait `Trait` cannot be made into an object
|
|
--> $DIR/wf-convert-unsafe-trait-obj.rs:17:17
|
|
|
|
|
LL | takes_trait(&S);
|
|
| ^^ `Trait` 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/wf-convert-unsafe-trait-obj.rs:6:14
|
|
|
|
|
LL | trait Trait: Sized {}
|
|
| ----- ^^^^^ ...because it requires `Self: Sized`
|
|
| |
|
|
| this trait cannot be made into an object...
|
|
= help: only type `S` implements the trait, consider using it directly instead
|
|
= note: required for the cast from `&S` to `&dyn Trait`
|
|
|
|
error[E0038]: the trait `Trait` cannot be made into an object
|
|
--> $DIR/wf-convert-unsafe-trait-obj.rs:15:5
|
|
|
|
|
LL | &S as &dyn Trait;
|
|
| ^^ `Trait` 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/wf-convert-unsafe-trait-obj.rs:6:14
|
|
|
|
|
LL | trait Trait: Sized {}
|
|
| ----- ^^^^^ ...because it requires `Self: Sized`
|
|
| |
|
|
| this trait cannot be made into an object...
|
|
= help: only type `S` implements the trait, consider using it directly instead
|
|
= note: required for the cast from `&S` to `&dyn Trait`
|
|
|
|
error: aborting due to 3 previous errors
|
|
|
|
For more information about this error, try `rustc --explain E0038`.
|