mirror of https://github.com/rust-lang/rust
43 lines
1.7 KiB
Plaintext
43 lines
1.7 KiB
Plaintext
error[E0277]: the size for values of type `Self` cannot be known at compilation time
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--> $DIR/object-safety-supertrait-mentions-Self.rs:8:13
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LL | trait Baz : Bar<Self> {
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| ^^^^^^^^^ doesn't have a size known at compile-time
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note: required by an implicit `Sized` bound in `Bar`
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--> $DIR/object-safety-supertrait-mentions-Self.rs:4:11
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LL | trait Bar<T> {
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| ^ required by the implicit `Sized` requirement on this type parameter in `Bar`
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help: consider further restricting `Self`
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LL | trait Baz : Bar<Self> + Sized {
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| +++++++
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help: consider relaxing the implicit `Sized` restriction
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LL | trait Bar<T: ?Sized> {
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| ++++++++
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error[E0038]: the trait `Baz` cannot be made into an object
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--> $DIR/object-safety-supertrait-mentions-Self.rs:16:31
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LL | fn make_baz<T:Baz>(t: &T) -> &dyn Baz {
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| ^^^^^^^ `Baz` 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-safety-supertrait-mentions-Self.rs:8:13
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LL | trait Baz : Bar<Self> {
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| --- ^^^^^^^^^ ...because it uses `Self` as a type parameter
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| |
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| this trait cannot be made into an object...
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help: consider using an opaque type instead
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LL | fn make_baz<T:Baz>(t: &T) -> &impl Baz {
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| ~~~~
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error: aborting due to 2 previous errors
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Some errors have detailed explanations: E0038, E0277.
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For more information about an error, try `rustc --explain E0038`.
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