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
|
//@ run-pass
#![allow(warnings)]
#[derive(Debug)]
pub struct Bar { pub t: () }
impl<T> Access for T {}
pub trait Access {
fn field(&self, _: impl Sized, _: impl Sized) {
panic!("got into Access::field");
}
fn finish(&self) -> Result<(), std::fmt::Error> {
panic!("got into Access::finish");
}
fn debug_struct(&self, _: impl Sized, _: impl Sized) {
panic!("got into Access::debug_struct");
}
}
impl<T> MutAccess for T {}
pub trait MutAccess {
fn field(&mut self, _: impl Sized, _: impl Sized) {
panic!("got into MutAccess::field");
}
fn finish(&mut self) -> Result<(), std::fmt::Error> {
panic!("got into MutAccess::finish");
}
fn debug_struct(&mut self, _: impl Sized, _: impl Sized) {
panic!("got into MutAccess::debug_struct");
}
}
fn main() {
let bar = Bar { t: () };
assert_eq!("Bar { t: () }", format!("{:?}", bar));
}
|
