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error: associated item referring to unboxed trait object for its own trait
--> $DIR/object-unsafe-trait-should-use-self.rs:3:13
|
LL | trait A: Sized {
| - in this trait
LL | fn f(a: A) -> A;
| ^ ^
|
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help: you might have meant to use `Self` to refer to the implementing type
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|
LL | fn f(a: Self) -> Self;
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| ~~~~ ~~~~
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error[E0038]: the trait `A` cannot be made into an object
--> $DIR/object-unsafe-trait-should-use-self.rs:3:13
|
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LL | fn f(a: A) -> A;
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| ^ `A` cannot be made into an object
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|
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-unsafe-trait-should-use-self.rs:2:10
|
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LL | trait A: Sized {
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| - ^^^^^ ...because it requires `Self: Sized`
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| |
| this trait cannot be made into an object...
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error: associated item referring to unboxed trait object for its own trait
--> $DIR/object-unsafe-trait-should-use-self.rs:8:13
|
LL | trait B {
| - in this trait
LL | fn f(a: B) -> B;
| ^ ^
|
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help: you might have meant to use `Self` to refer to the implementing type
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|
LL | fn f(a: Self) -> Self;
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| ~~~~ ~~~~
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error[E0038]: the trait `B` cannot be made into an object
--> $DIR/object-unsafe-trait-should-use-self.rs:8:13
|
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LL | fn f(a: B) -> B;
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| ^ `B` cannot be made into an object
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|
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-unsafe-trait-should-use-self.rs:8:8
|
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LL | trait B {
| - this trait cannot be made into an object...
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LL | fn f(a: B) -> B;
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| ^ ...because associated function `f` has no `self` parameter
help: consider turning `f` into a method by giving it a `&self` argument
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|
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LL | fn f(&self, a: B) -> B;
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| ++++++
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help: alternatively, consider constraining `f` so it does not apply to trait objects
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|
LL | fn f(a: B) -> B where Self: Sized;
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| +++++++++++++++++
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error: aborting due to 4 previous errors
For more information about this error, try `rustc --explain E0038`.
