50 lines
2.1 KiB
Plaintext
50 lines
2.1 KiB
Plaintext
error[E0277]: the trait bound `U: Copy` is not satisfied
|
|
--> $DIR/wf-fn-where-clause.rs:8:24
|
|
|
|
|
LL | fn foo<T,U>() where T: ExtraCopy<U>
|
|
| ^^^^^^^^^^^^ the trait `Copy` is not implemented for `U`
|
|
|
|
|
note: required by a bound in `ExtraCopy`
|
|
--> $DIR/wf-fn-where-clause.rs:6:19
|
|
|
|
|
LL | trait ExtraCopy<T:Copy> { }
|
|
| ^^^^ required by this bound in `ExtraCopy`
|
|
help: consider further restricting type parameter `U`
|
|
|
|
|
LL | fn foo<T,U>() where T: ExtraCopy<U>, U: std::marker::Copy
|
|
| ++++++++++++++++++++++
|
|
|
|
error[E0038]: the trait `Copy` cannot be made into an object
|
|
--> $DIR/wf-fn-where-clause.rs:12:16
|
|
|
|
|
LL | fn bar() where Vec<dyn Copy>:, {}
|
|
| ^^^^^^^^^^^^^ `Copy` cannot be made into an object
|
|
|
|
|
= note: the trait cannot be made into an object because it requires `Self: Sized`
|
|
= note: for a trait to be "dyn-compatible" 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>
|
|
|
|
error[E0277]: the size for values of type `(dyn Copy + 'static)` cannot be known at compilation time
|
|
--> $DIR/wf-fn-where-clause.rs:12:16
|
|
|
|
|
LL | fn bar() where Vec<dyn Copy>:, {}
|
|
| ^^^^^^^^^^^^^ doesn't have a size known at compile-time
|
|
|
|
|
= help: the trait `Sized` is not implemented for `(dyn Copy + 'static)`
|
|
note: required by an implicit `Sized` bound in `Vec`
|
|
--> $DIR/wf-fn-where-clause.rs:16:12
|
|
|
|
|
LL | struct Vec<T> {
|
|
| ^ required by the implicit `Sized` requirement on this type parameter in `Vec`
|
|
help: you could relax the implicit `Sized` bound on `T` if it were used through indirection like `&T` or `Box<T>`
|
|
--> $DIR/wf-fn-where-clause.rs:16:12
|
|
|
|
|
LL | struct Vec<T> {
|
|
| ^ this could be changed to `T: ?Sized`...
|
|
LL | t: T,
|
|
| - ...if indirection were used here: `Box<T>`
|
|
|
|
error: aborting due to 3 previous errors
|
|
|
|
Some errors have detailed explanations: E0038, E0277.
|
|
For more information about an error, try `rustc --explain E0038`.
|