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warning: trait objects without an explicit `dyn` are deprecated
--> $DIR/avoid-ice-on-warning-2.rs:4:13
|
LL | fn id<F>(f: Copy) -> usize {
| ^^^^
|
= warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
= note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
= note: `#[warn(bare_trait_objects)]` on by default
help: if this is a dyn-compatible trait, use `dyn`
|
LL | fn id<F>(f: dyn Copy) -> usize {
| +++
warning: trait objects without an explicit `dyn` are deprecated
--> $DIR/avoid-ice-on-warning-2.rs:4:13
|
LL | fn id<F>(f: Copy) -> usize {
| ^^^^
|
= warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
= note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
help: if this is a dyn-compatible trait, use `dyn`
|
LL | fn id<F>(f: dyn Copy) -> usize {
| +++
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 "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[E0618]: expected function, found `(dyn Copy + 'static)`
--> $DIR/avoid-ice-on-warning-2.rs:12:5
|
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:4:13
|
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; 2 warnings emitted
Some errors have detailed explanations: E0038, E0277, E0618.
For more information about an error, try `rustc --explain E0038`.
|
