blob: 9fe90ab7bec7fcb41f779bee3e785c84d22077ab (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
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`.
|
