mirror of https://github.com/rust-lang/rust
78 lines
3.2 KiB
Plaintext
78 lines
3.2 KiB
Plaintext
error[E0038]: the trait `Trait` cannot be made into an object
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--> $DIR/object-unsafe-trait-references-self.rs:9:12
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LL | fn bar(x: &dyn Trait) {}
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| ^^^^^^^^^ `Trait` 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>
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--> $DIR/object-unsafe-trait-references-self.rs:2:22
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LL | trait Trait {
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| ----- this trait cannot be made into an object...
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LL | fn baz(&self, _: Self) {}
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| ^^^^ ...because method `baz` references the `Self` type in this parameter
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LL |
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LL | fn bat(&self) -> Self {}
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| ^^^^ ...because method `bat` references the `Self` type in its return type
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= help: consider moving `baz` to another trait
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= help: consider moving `bat` to another trait
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error[E0038]: the trait `Other` cannot be made into an object
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--> $DIR/object-unsafe-trait-references-self.rs:13:12
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LL | fn foo(x: &dyn Other) {}
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| ^^^^^^^^^ `Other` 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>
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--> $DIR/object-unsafe-trait-references-self.rs:11:14
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LL | trait Other: Sized {}
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| ----- ^^^^^ ...because it requires `Self: Sized`
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| |
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| this trait cannot be made into an object...
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error[E0277]: the size for values of type `Self` cannot be known at compilation time
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--> $DIR/object-unsafe-trait-references-self.rs:2:19
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LL | fn baz(&self, _: Self) {}
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| ^ doesn't have a size known at compile-time
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= help: unsized fn params are gated as an unstable feature
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help: consider further restricting `Self`
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LL | fn baz(&self, _: Self) where Self: Sized {}
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| +++++++++++++++++
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help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn baz(&self, _: &Self) {}
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| +
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error[E0308]: mismatched types
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--> $DIR/object-unsafe-trait-references-self.rs:4:27
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LL | trait Trait {
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| ----------- expected this type parameter
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...
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LL | fn bat(&self) -> Self {}
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| ^^ expected type parameter `Self`, found `()`
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= note: expected type parameter `Self`
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found unit type `()`
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error[E0277]: the size for values of type `Self` cannot be known at compilation time
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--> $DIR/object-unsafe-trait-references-self.rs:4:22
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LL | fn bat(&self) -> Self {}
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| ^^^^ doesn't have a size known at compile-time
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= note: the return type of a function must have a statically known size
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help: consider further restricting `Self`
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LL | fn bat(&self) -> Self where Self: Sized {}
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| +++++++++++++++++
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error: aborting due to 5 previous errors
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Some errors have detailed explanations: E0038, E0277, E0308.
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For more information about an error, try `rustc --explain E0038`.
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