mirror of https://github.com/rust-lang/rust
42 lines
1.6 KiB
Plaintext
42 lines
1.6 KiB
Plaintext
error[E0038]: the trait `Copy` cannot be made into an object
|
|
--> $DIR/avoid-ice-on-warning-2.rs:4:13
|
|
|
|
|
LL | fn id<F>(f: Copy) -> usize {
|
|
| ^^^^ `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 "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[E0618]: expected function, found `(dyn Copy + 'static)`
|
|
--> $DIR/avoid-ice-on-warning-2.rs:11:5
|
|
|
|
|
LL | fn id<F>(f: Copy) -> usize {
|
|
| - `f` has type `(dyn Copy + 'static)`
|
|
...
|
|
LL | f()
|
|
| ^--
|
|
| |
|
|
| call expression requires function
|
|
|
|
error[E0277]: the size for values of type `(dyn Copy + 'static)` cannot be known at compilation time
|
|
--> $DIR/avoid-ice-on-warning-2.rs:4:10
|
|
|
|
|
LL | fn id<F>(f: Copy) -> usize {
|
|
| ^ doesn't have a size known at compile-time
|
|
|
|
|
= help: the trait `Sized` is not implemented for `(dyn Copy + 'static)`
|
|
= help: unsized fn params are gated as an unstable feature
|
|
help: you can use `impl Trait` as the argument type
|
|
|
|
|
LL | fn id<F>(f: impl Copy) -> usize {
|
|
| ++++
|
|
help: function arguments must have a statically known size, borrowed types always have a known size
|
|
|
|
|
LL | fn id<F>(f: &dyn Copy) -> usize {
|
|
| ++++
|
|
|
|
error: aborting due to 3 previous errors
|
|
|
|
Some errors have detailed explanations: E0038, E0277, E0618.
|
|
For more information about an error, try `rustc --explain E0038`.
|