Account for impl Trait { when impl Trait for Type { was intended · rust-lang/rust@e057c43 (original) (raw)
``
1
`` +
warning: trait objects without an explicit dyn are deprecated
``
``
2
`+
--> $DIR/missing-for-type-in-impl.rs:8:6
`
``
3
`+
|
`
``
4
`+
LL | impl Foo {
`
``
5
`+
| ^^^^^^^^
`
``
6
`+
|
`
``
7
`+
= warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
`
``
8
`+
= note: for more information, see https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html
`
``
9
`` +
= note: #[warn(bare_trait_objects)] on by default
``
``
10
`` +
help: if this is a dyn-compatible trait, use dyn
``
``
11
`+
|
`
``
12
`+
LL | impl dyn Foo {
`
``
13
`+
| +++
`
``
14
`+
help: you might have intended to implement this trait for a given type
`
``
15
`+
|
`
``
16
`+
LL | impl Foo for /* Type */ {
`
``
17
`+
| ++++++++++++++
`
``
18
+
``
19
`` +
warning: trait objects without an explicit dyn are deprecated
``
``
20
`+
--> $DIR/missing-for-type-in-impl.rs:8:6
`
``
21
`+
|
`
``
22
`+
LL | impl Foo {
`
``
23
`+
| ^^^^^^^^
`
``
24
`+
|
`
``
25
`+
= warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
`
``
26
`+
= note: for more information, see https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html
`
``
27
`` +
= note: duplicate diagnostic emitted due to -Z deduplicate-diagnostics=no
``
``
28
`` +
help: if this is a dyn-compatible trait, use dyn
``
``
29
`+
|
`
``
30
`+
LL | impl dyn Foo {
`
``
31
`+
| +++
`
``
32
`+
help: you might have intended to implement this trait for a given type
`
``
33
`+
|
`
``
34
`+
LL | impl Foo for /* Type */ {
`
``
35
`+
| ++++++++++++++
`
``
36
+
``
37
`` +
error[E0038]: the trait Foo cannot be made into an object
``
``
38
`+
--> $DIR/missing-for-type-in-impl.rs:8:6
`
``
39
`+
|
`
``
40
`+
LL | impl Foo {
`
``
41
`` +
| ^^^^^^^^ Foo cannot be made into an object
``
``
42
`+
|
`
``
43
`+
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
`
``
44
`+
--> $DIR/missing-for-type-in-impl.rs:4:8
`
``
45
`+
|
`
``
46
`+
LL | trait Foo {
`
``
47
`+
| --- this trait cannot be made into an object...
`
``
48
`+
LL | fn id(me: T) -> T;
`
``
49
`` +
| ^^ ...because associated function id has no self parameter
``
``
50
`` +
help: consider turning id into a method by giving it a &self argument
``
``
51
`+
|
`
``
52
`+
LL | fn id(&self, me: T) -> T;
`
``
53
`+
| ++++++
`
``
54
`` +
help: alternatively, consider constraining id so it does not apply to trait objects
``
``
55
`+
|
`
``
56
`+
LL | fn id(me: T) -> T where Self: Sized;
`
``
57
`+
| +++++++++++++++++
`
``
58
+
``
59
`` +
error[E0277]: the trait bound i64: Foo<i64> is not satisfied
``
``
60
`+
--> $DIR/missing-for-type-in-impl.rs:19:19
`
``
61
`+
|
`
``
62
`+
LL | let x: i64 = <i64 as Foo>::id(10);
`
``
63
`` +
| ^^^ the trait Foo<i64> is not implemented for i64
``
``
64
`+
|
`
``
65
`+
help: this trait has no implementations, consider adding one
`
``
66
`+
--> $DIR/missing-for-type-in-impl.rs:3:1
`
``
67
`+
|
`
``
68
`+
LL | trait Foo {
`
``
69
`+
| ^^^^^^^^^^^^
`
``
70
+
``
71
`+
error: aborting due to 2 previous errors; 2 warnings emitted
`
``
72
+
``
73
`+
Some errors have detailed explanations: E0038, E0277.
`
``
74
`` +
For more information about an error, try rustc --explain E0038.
``