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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
use disjoint_impls::disjoint_impls;
pub trait Dispatch {
type Group;
}
pub enum GroupA {}
impl Dispatch for Option<String> {
type Group = GroupA;
}
pub enum GroupB {}
impl Dispatch for i32 {
type Group = GroupB;
}
struct Wrapper<T>(T);
disjoint_impls! {
impl<T> Wrapper<T>
where
Option<T>: Dispatch<Group = GroupA>,
{
fn kita() -> &'static str {
"Blanket A"
}
}
impl<T> Wrapper<T>
where
T: Dispatch<Group = GroupB>,
{
fn kita() -> String {
"Blanket B".to_owned()
}
}
}
/*
const _: () = {
trait Wrapper0<_TŠČ1: ?core::marker::Sized, _TŠČ0> {
fn kita_šč() -> &'static str;
}
impl<T> Wrapper0<GroupA, T> for Wrapper<T>
where
Option<T>: Dispatch<Group = GroupA>,
{
fn kita_šč() -> &'static str {
"Blanket A"
}
}
trait Wrapper1<_TŠČ1: ?core::marker::Sized, _TŠČ0> {
fn kita_šč() -> String;
}
impl<T> Wrapper1<GroupB, T> for Wrapper<T>
where
T: Dispatch<Group = GroupB>,
{
fn kita_šč() -> String {
"Blanket B".to_owned()
}
}
impl<_TŠČ0> Wrapper<_TŠČ0>
where
Option<_TŠČ0>: Dispatch,
Self: for<'_dšč> Wrapper0<<Option<_TŠČ0> as Dispatch>::Group, _TŠČ0>,
{
fn kita() -> &'static str {
<Self as Wrapper0<
<Option<_TŠČ0> as Dispatch>::Group,
_TŠČ0,
>>::kita_šč()
}
}
impl<_TŠČ0> Wrapper<_TŠČ0>
where
_TŠČ0: Dispatch,
Self: for<'_dšč> Wrapper1<<_TŠČ0 as Dispatch>::Group, _TŠČ0>,
{
fn kita() -> String {
<Self as Wrapper1<<_TŠČ0 as Dispatch>::Group, _TŠČ0>>::kita_šč()
}
}
};
*/
#[test]
fn differing_inherent_items() {
assert_eq!("Blanket A", Wrapper::<String>::kita());
assert_eq!("Blanket B".to_owned(), Wrapper::<i32>::kita());
}