mirror of https://github.com/rust-lang/rust
45 lines
1.9 KiB
Plaintext
45 lines
1.9 KiB
Plaintext
error[E0038]: the trait `Trait` cannot be made into an object
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--> $DIR/E0038.rs:5:20
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LL | fn call_foo(x: Box<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/E0038.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 foo(&self) -> Self;
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| ^^^^ ...because method `foo` references the `Self` type in its return type
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= help: consider moving `foo` to another trait
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error[E0038]: the trait `Trait` cannot be made into an object
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--> $DIR/E0038.rs:7:13
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LL | let y = x.foo();
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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/E0038.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 foo(&self) -> Self;
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| ^^^^ ...because method `foo` references the `Self` type in its return type
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= help: consider moving `foo` to another trait
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error[E0277]: the size for values of type `dyn Trait` cannot be known at compilation time
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--> $DIR/E0038.rs:7:9
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LL | let y = x.foo();
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| ^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `dyn Trait`
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= note: all local variables must have a statically known size
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= help: unsized locals are gated as an unstable feature
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error: aborting due to 3 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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