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
|
//@ run-pass
use std::ops::Add;
struct S<T, U = u16> {
a: T,
b: U,
}
trait Tr {
fn f(&self) -> Self;
}
impl<T: Default + Add<u8, Output = T>, U: Default> Tr for S<T, U> {
fn f(&self) -> Self {
let s = Self { a: Default::default(), b: Default::default() };
match s {
Self { a, b } => Self { a: a + 1, b: b }
}
}
}
impl<T: Default, U: Default + Add<u16, Output = U>> S<T, U> {
fn g(&self) -> Self {
let s = Self { a: Default::default(), b: Default::default() };
match s {
Self { a, b } => Self { a: a, b: b + 1 }
}
}
}
impl S<u8> {
fn new() -> Self {
Self { a: 0, b: 1 }
}
}
fn main() {
let s0 = S::new();
let s1 = s0.f();
assert_eq!(s1.a, 1);
assert_eq!(s1.b, 0);
let s2 = s0.g();
assert_eq!(s2.a, 0);
assert_eq!(s2.b, 1);
}
|
