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warning: trait objects without an explicit `dyn` are deprecated
--> $DIR/not-on-bare-trait.rs:7:12
|
LL | fn foo(_x: Foo + Send) {
| ^^^^^^^^^^
|
= 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: use `dyn`
|
LL | fn foo(_x: dyn Foo + Send) {
| +++
error[E0277]: the size for values of type `(dyn Foo + Send + 'static)` cannot be known at compilation time
--> $DIR/not-on-bare-trait.rs:7:8
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LL | fn foo(_x: Foo + Send) {
| ^^ doesn't have a size known at compile-time
|
= help: the trait `Sized` is not implemented for `(dyn Foo + Send + 'static)`
= help: unsized fn params are gated as an unstable feature
help: you can use `impl Trait` as the argument type
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LL | fn foo(_x: impl Foo + Send) {
| ++++
help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn foo(_x: &Foo + Send) {
| +
error: aborting due to 1 previous error; 1 warning emitted
For more information about this error, try `rustc --explain E0277`.
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