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
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
// run-pass
#![feature(trait_upcasting)]
trait Foo: PartialEq<i32> + std::fmt::Debug + Send + Sync {
fn a(&self) -> i32 {
10
}
fn z(&self) -> i32 {
11
}
fn y(&self) -> i32 {
12
}
}
trait Bar1: Foo {
fn b(&self) -> i32 {
20
}
fn w(&self) -> i32 {
21
}
}
trait Bar2: Foo {
fn c(&self) -> i32 {
30
}
fn v(&self) -> i32 {
31
}
}
trait Baz: Bar1 + Bar2 {
fn d(&self) -> i32 {
40
}
}
impl Foo for i32 {
fn a(&self) -> i32 {
100
}
}
impl Bar1 for i32 {
fn b(&self) -> i32 {
200
}
}
impl Bar2 for i32 {
fn c(&self) -> i32 {
300
}
}
impl Baz for i32 {
fn d(&self) -> i32 {
400
}
}
fn main() {
let baz: &dyn Baz = &1;
let _: &dyn std::fmt::Debug = baz;
assert_eq!(*baz, 1);
assert_eq!(baz.a(), 100);
assert_eq!(baz.b(), 200);
assert_eq!(baz.c(), 300);
assert_eq!(baz.d(), 400);
assert_eq!(baz.z(), 11);
assert_eq!(baz.y(), 12);
assert_eq!(baz.w(), 21);
assert_eq!(baz.v(), 31);
let bar1: &dyn Bar1 = baz;
let _: &dyn std::fmt::Debug = bar1;
assert_eq!(*bar1, 1);
assert_eq!(bar1.a(), 100);
assert_eq!(bar1.b(), 200);
assert_eq!(bar1.z(), 11);
assert_eq!(bar1.y(), 12);
assert_eq!(bar1.w(), 21);
let bar2: &dyn Bar2 = baz;
let _: &dyn std::fmt::Debug = bar2;
assert_eq!(*bar2, 1);
assert_eq!(bar2.a(), 100);
assert_eq!(bar2.c(), 300);
assert_eq!(bar2.z(), 11);
assert_eq!(bar2.y(), 12);
assert_eq!(bar2.v(), 31);
let foo: &dyn Foo = baz;
let _: &dyn std::fmt::Debug = foo;
assert_eq!(*foo, 1);
assert_eq!(foo.a(), 100);
let foo: &dyn Foo = bar1;
let _: &dyn std::fmt::Debug = foo;
assert_eq!(*foo, 1);
assert_eq!(foo.a(), 100);
let foo: &dyn Foo = bar2;
let _: &dyn std::fmt::Debug = foo;
assert_eq!(*foo, 1);
assert_eq!(foo.a(), 100);
}
|
