mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-01 11:13:43 +00:00
38 lines
1.2 KiB
Plaintext
38 lines
1.2 KiB
Plaintext
error[E0746]: return type cannot have an unboxed trait object
|
|
--> $DIR/E0746.rs:8:13
|
|
|
|
|
LL | fn foo() -> dyn Trait { Struct }
|
|
| ^^^^^^^^^ doesn't have a size known at compile-time
|
|
|
|
|
help: return an `impl Trait` instead of a `dyn Trait`, if all returned values are the same type
|
|
|
|
|
LL | fn foo() -> impl Trait { Struct }
|
|
| ~~~~
|
|
help: box the return type, and wrap all of the returned values in `Box::new`
|
|
|
|
|
LL | fn foo() -> Box<dyn Trait> { Box::new(Struct) }
|
|
| ++++ + +++++++++ +
|
|
|
|
error[E0746]: return type cannot have an unboxed trait object
|
|
--> $DIR/E0746.rs:11:13
|
|
|
|
|
LL | fn bar() -> dyn Trait {
|
|
| ^^^^^^^^^ doesn't have a size known at compile-time
|
|
|
|
|
help: return an `impl Trait` instead of a `dyn Trait`, if all returned values are the same type
|
|
|
|
|
LL | fn bar() -> impl Trait {
|
|
| ~~~~
|
|
help: box the return type, and wrap all of the returned values in `Box::new`
|
|
|
|
|
LL ~ fn bar() -> Box<dyn Trait> {
|
|
LL | if true {
|
|
LL ~ return Box::new(0);
|
|
LL | }
|
|
LL ~ Box::new(42)
|
|
|
|
|
|
|
error: aborting due to 2 previous errors
|
|
|
|
For more information about this error, try `rustc --explain E0746`.
|