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
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
error[E0782]: expected a type, found a trait
--> $DIR/ice-unsized-fn-params.rs:12:13
|
LL | fn g(b: B) -> B;
| ^
|
= note: `B` is dyn-incompatible, otherwise a trait object could be used
help: use a new generic type parameter, constrained by `B`
|
LL - fn g(b: B) -> B;
LL + fn g<T: B>(b: T) -> B;
|
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 g(b: impl B) -> B;
| ++++
error[E0782]: expected a type, found a trait
--> $DIR/ice-unsized-fn-params.rs:12:19
|
LL | fn g(b: B) -> B;
| ^
|
help: `B` is dyn-incompatible, use `impl B` to return an opaque type, as long as you return a single underlying type
|
LL | fn g(b: B) -> impl B;
| ++++
error[E0782]: expected a type, found a trait
--> $DIR/ice-unsized-fn-params.rs:6:13
|
LL | fn f(a: A) -> A;
| ^
|
= note: `A` is dyn-incompatible, otherwise a trait object could be used
help: use a new generic type parameter, constrained by `A`
|
LL - fn f(a: A) -> A;
LL + fn f<T: A>(a: T) -> A;
|
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 f(a: impl A) -> A;
| ++++
error[E0782]: expected a type, found a trait
--> $DIR/ice-unsized-fn-params.rs:6:19
|
LL | fn f(a: A) -> A;
| ^
|
help: `A` is dyn-incompatible, use `impl A` to return an opaque type, as long as you return a single underlying type
|
LL | fn f(a: A) -> impl A;
| ++++
error: aborting due to 4 previous errors
For more information about this error, try `rustc --explain E0782`.
|
