-error[E0277]: the trait bound `U: std::marker::Copy` is not satisfied
- --> $DIR/wf-fn-where-clause.rs:8:1
+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>
-LL | | {
-LL | | }
- | |_^ the trait `std::marker::Copy` is not implemented for `U`
+LL | fn foo<T,U>() where T: ExtraCopy<U>
+ | ^^^^^^^^^^^^ the trait `Copy` is not implemented for `U`
|
- = help: consider adding a `where U: std::marker::Copy` bound
-note: required by `ExtraCopy`
- --> $DIR/wf-fn-where-clause.rs:6:1
+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[E0277]: the size for values of type `(dyn std::marker::Copy + 'static)` cannot be known at compilation time
- --> $DIR/wf-fn-where-clause.rs:12:1
+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
+ | ^^^^^^^^^^^^^ doesn't have a size known at compile-time
+ |
+ = help: the trait `Sized` is not implemented for `(dyn Copy + 'static)`
+note: required by a bound in `Vec`
+ --> $DIR/wf-fn-where-clause.rs:16:12
+ |
+LL | struct Vec<T> {
+ | ^ required by this bound 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
|
- = help: the trait `std::marker::Sized` is not implemented for `(dyn std::marker::Copy + 'static)`
- = note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
- = note: required by `std::vec::Vec`
+LL | struct Vec<T> {
+ | ^ this could be changed to `T: ?Sized`...
+LL | t: T,
+ | - ...if indirection were used here: `Box<T>`
-error[E0038]: the trait `std::marker::Copy` cannot be made into an object
- --> $DIR/wf-fn-where-clause.rs:12:1
+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>:, {}
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::marker::Copy` cannot be made into an object
+ | ^^^^^^^^^^^^^ `Copy` cannot be made into an object
|
- = note: the trait cannot require that `Self : Sized`
+ = note: the trait cannot be made into an object because it requires `Self: Sized`
+ = 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>
error: aborting due to 3 previous errors
-Some errors occurred: E0038, E0277.
+Some errors have detailed explanations: E0038, E0277.
For more information about an error, try `rustc --explain E0038`.