mirror of https://github.com/rust-lang/rust
70 lines
2.8 KiB
Plaintext
70 lines
2.8 KiB
Plaintext
warning: trait objects without an explicit `dyn` are deprecated
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--> $DIR/avoid-ice-on-warning-2.rs:4:13
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LL | fn id<F>(f: Copy) -> usize {
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| ^^^^
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= warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
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= note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
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= note: `#[warn(bare_trait_objects)]` on by default
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help: if this is an object-safe trait, use `dyn`
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LL | fn id<F>(f: dyn Copy) -> usize {
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| +++
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warning: trait objects without an explicit `dyn` are deprecated
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--> $DIR/avoid-ice-on-warning-2.rs:4:13
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LL | fn id<F>(f: Copy) -> usize {
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| ^^^^
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= warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
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= note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
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= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
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help: if this is an object-safe trait, use `dyn`
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LL | fn id<F>(f: dyn Copy) -> usize {
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| +++
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error[E0038]: the trait `Copy` cannot be made into an object
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--> $DIR/avoid-ice-on-warning-2.rs:4:13
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LL | fn id<F>(f: Copy) -> usize {
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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[E0618]: expected function, found `(dyn Copy + 'static)`
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--> $DIR/avoid-ice-on-warning-2.rs:11:5
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LL | fn id<F>(f: Copy) -> usize {
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| - `f` has type `(dyn Copy + 'static)`
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...
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LL | f()
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| ^--
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| |
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| call expression requires function
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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/avoid-ice-on-warning-2.rs:4:10
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LL | fn id<F>(f: Copy) -> usize {
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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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= help: unsized fn params are gated as an unstable feature
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help: you can use `impl Trait` as the argument type
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LL | fn id<F>(f: impl Copy) -> usize {
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| ++++
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help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn id<F>(f: &dyn Copy) -> usize {
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| ++++
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error: aborting due to 3 previous errors; 2 warnings emitted
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Some errors have detailed explanations: E0038, E0277, E0618.
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For more information about an error, try `rustc --explain E0038`.
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