mirror of https://github.com/rust-lang/rust
50 lines
2.1 KiB
Plaintext
50 lines
2.1 KiB
Plaintext
error[E0277]: the trait bound `U: Copy` is not satisfied
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--> $DIR/wf-fn-where-clause.rs:8:24
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LL | fn foo<T,U>() where T: ExtraCopy<U>
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| ^^^^^^^^^^^^ the trait `Copy` is not implemented for `U`
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note: required by a bound in `ExtraCopy`
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--> $DIR/wf-fn-where-clause.rs:6:19
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LL | trait ExtraCopy<T:Copy> { }
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| ^^^^ required by this bound in `ExtraCopy`
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help: consider further restricting type parameter `U`
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LL | fn foo<T,U>() where T: ExtraCopy<U>, U: std::marker::Copy
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| ++++++++++++++++++++++
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error[E0038]: the trait `Copy` cannot be made into an object
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--> $DIR/wf-fn-where-clause.rs:12:16
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LL | fn bar() where Vec<dyn Copy>:, {}
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| ^^^^^^^^^^^^^ `Copy` cannot be made into an object
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= note: the trait cannot be made into an object because it requires `Self: Sized`
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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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error[E0277]: the size for values of type `(dyn Copy + 'static)` cannot be known at compilation time
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--> $DIR/wf-fn-where-clause.rs:12:16
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LL | fn bar() where Vec<dyn Copy>:, {}
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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 Copy + 'static)`
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note: required by an implicit `Sized` bound in `Vec`
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--> $DIR/wf-fn-where-clause.rs:16:12
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LL | struct Vec<T> {
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| ^ required by the implicit `Sized` requirement on this type parameter in `Vec`
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help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
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--> $DIR/wf-fn-where-clause.rs:16:12
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LL | struct Vec<T> {
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| ^ this could be changed to `T: ?Sized`...
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LL | t: T,
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| - ...if indirection were used here: `Box<T>`
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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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