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
38
39
40
41
42
43
44
|
error[E0038]: the trait `Trait` cannot be made into an object
--> $DIR/E0038.rs:5:20
|
LL | fn call_foo(x: Box<dyn Trait>) {
| ^^^^^^^^^ `Trait` cannot be made into an object
|
note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
--> $DIR/E0038.rs:2:22
|
LL | trait Trait {
| ----- this trait cannot be made into an object...
LL | fn foo(&self) -> Self;
| ^^^^ ...because method `foo` references the `Self` type in its return type
= help: consider moving `foo` to another trait
error[E0038]: the trait `Trait` cannot be made into an object
--> $DIR/E0038.rs:7:13
|
LL | let y = x.foo();
| ^^^^^^^ `Trait` cannot be made into an object
|
note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
--> $DIR/E0038.rs:2:22
|
LL | trait Trait {
| ----- this trait cannot be made into an object...
LL | fn foo(&self) -> Self;
| ^^^^ ...because method `foo` references the `Self` type in its return type
= help: consider moving `foo` to another trait
error[E0277]: the size for values of type `dyn Trait` cannot be known at compilation time
--> $DIR/E0038.rs:7:9
|
LL | let y = x.foo();
| ^ doesn't have a size known at compile-time
|
= help: the trait `Sized` is not implemented for `dyn Trait`
= note: all local variables must have a statically known size
= help: unsized locals are gated as an unstable feature
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0038, E0277.
For more information about an error, try `rustc --explain E0038`.
|
