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error[E0038]: the trait `A` is not dyn compatible
--> $DIR/dyn-incompatible-trait-should-use-self.rs:2:13
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LL | fn f(a: dyn A) -> dyn A;
| ^^^^^ `A` is not dyn compatible
|
note: for a trait to be dyn compatible it needs to allow building a vtable
for more information, visit <https://doc.rust-lang.org/reference/items/traits.html#dyn-compatibility>
--> $DIR/dyn-incompatible-trait-should-use-self.rs:1:10
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LL | trait A: Sized {
| - ^^^^^ ...because it requires `Self: Sized`
| |
| this trait is not dyn compatible...
help: you might have meant to use `Self` to refer to the implementing type
|
LL - fn f(a: dyn A) -> dyn A;
LL + fn f(a: Self) -> dyn A;
|
error[E0038]: the trait `B` is not dyn compatible
--> $DIR/dyn-incompatible-trait-should-use-self.rs:6:13
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LL | fn f(a: dyn B) -> dyn B;
| ^^^^^ `B` is not dyn compatible
|
note: for a trait to be dyn compatible it needs to allow building a vtable
for more information, visit <https://doc.rust-lang.org/reference/items/traits.html#dyn-compatibility>
--> $DIR/dyn-incompatible-trait-should-use-self.rs:6:8
|
LL | trait B {
| - this trait is not dyn compatible...
LL | fn f(a: dyn B) -> dyn B;
| ^ ...because associated function `f` has no `self` parameter
help: consider turning `f` into a method by giving it a `&self` argument
|
LL | fn f(&self, a: dyn B) -> dyn B;
| ++++++
help: alternatively, consider constraining `f` so it does not apply to trait objects
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LL | fn f(a: dyn B) -> dyn B where Self: Sized;
| +++++++++++++++++
help: you might have meant to use `Self` to refer to the implementing type
|
LL - fn f(a: dyn B) -> dyn B;
LL + fn f(a: Self) -> dyn B;
|
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0038`.
|
