51 lines
2.4 KiB
Plaintext
51 lines
2.4 KiB
Plaintext
warning: trait objects without an explicit `dyn` are deprecated
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--> $DIR/avoid-ice-on-warning-2.rs:1:13
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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: `Copy` it is not object safe, so it can't be `dyn`
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= note: `#[warn(bare_trait_objects)]` on by default
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help: use a new generic type parameter, constrained by `Copy`
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LL | fn id<F, T: Copy>(f: T) -> usize {
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| +++++++++ ~
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help: you can also use an opaque type, but users won't be able to specify the type parameter when calling the `fn`, having to rely exclusively on type inference
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LL | fn id<F>(f: impl 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:1:13
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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: `Copy` it is not object safe, so it can't be `dyn`
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= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
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help: use a new generic type parameter, constrained by `Copy`
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LL | fn id<F, T: Copy>(f: T) -> usize {
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| +++++++++ ~
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help: you can also use an opaque type, but users won't be able to specify the type parameter when calling the `fn`, having to rely exclusively on type inference
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LL | fn id<F>(f: impl 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:1:13
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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: aborting due to 1 previous error; 2 warnings emitted
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For more information about this error, try `rustc --explain E0038`.
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