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error[E0782]: expected a type, found a trait
--> $DIR/dyn-2021-edition-error.rs:3:17
|
LL | fn function(x: &SomeTrait, y: Box<SomeTrait>) {
| ^^^^^^^^^
|
help: use a new generic type parameter, constrained by `SomeTrait`
|
LL - fn function(x: &SomeTrait, y: Box<SomeTrait>) {
LL + fn function<T: SomeTrait>(x: &T, y: Box<SomeTrait>) {
|
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
|
LL | fn function(x: &impl SomeTrait, y: Box<SomeTrait>) {
| ++++
help: alternatively, use a trait object to accept any type that implements `SomeTrait`, accessing its methods at runtime using dynamic dispatch
|
LL | fn function(x: &dyn SomeTrait, y: Box<SomeTrait>) {
| +++
error[E0782]: expected a type, found a trait
--> $DIR/dyn-2021-edition-error.rs:3:35
|
LL | fn function(x: &SomeTrait, y: Box<SomeTrait>) {
| ^^^^^^^^^
|
help: you can add the `dyn` keyword if you want a trait object
|
LL | fn function(x: &SomeTrait, y: Box<dyn SomeTrait>) {
| +++
error[E0782]: expected a type, found a trait
--> $DIR/dyn-2021-edition-error.rs:12:24
|
LL | fn foo() -> *const SomeTrait;
| ^^^^^^^^^
|
help: you can add the `dyn` keyword if you want a trait object
|
LL | fn foo() -> *const dyn SomeTrait;
| +++
error[E0782]: expected a type, found a trait
--> $DIR/dyn-2021-edition-error.rs:6:14
|
LL | let _x: &SomeTrait = todo!();
| ^^^^^^^^^
|
help: you can add the `dyn` keyword if you want a trait object
|
LL | let _x: &dyn SomeTrait = todo!();
| +++
error: aborting due to 4 previous errors
For more information about this error, try `rustc --explain E0782`.
|
