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warning: trait objects without an explicit `dyn` are deprecated
--> $DIR/issue-58734.rs:20:5
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LL | Trait::nonexistent(());
| ^^^^^
|
= 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/edition-guide/rust-2021/warnings-promoted-to-error.html>
= note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
help: if this is a dyn-compatible trait, use `dyn`
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LL | <dyn Trait>::nonexistent(());
| ++++ +
error[E0038]: the trait `Trait` is not dyn compatible
--> $DIR/issue-58734.rs:20:5
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LL | Trait::nonexistent(());
| ^^^^^ `Trait` is not dyn compatible
|
note: for a trait to be dyn compatible it needs to allow building a vtable
for more information, visit <https://doc.rust-lang.org/reference/items/traits.html#dyn-compatibility>
--> $DIR/issue-58734.rs:4:8
|
LL | trait Trait {
| ----- this trait is not dyn compatible...
...
LL | fn dyn_incompatible() -> Self;
| ^^^^^^^^^^^^^^^^ ...because associated function `dyn_incompatible` has no `self` parameter
= help: only type `()` implements `Trait`; consider using it directly instead.
help: consider turning `dyn_incompatible` into a method by giving it a `&self` argument
|
LL | fn dyn_incompatible(&self) -> Self;
| +++++
help: alternatively, consider constraining `dyn_incompatible` so it does not apply to trait objects
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LL | fn dyn_incompatible() -> Self where Self: Sized;
| +++++++++++++++++
error: aborting due to 1 previous error; 1 warning emitted
For more information about this error, try `rustc --explain E0038`.
|
