blob: af85e5b2b02ab3a9295584aabd2dcdb0e03a5ae6 (
plain)
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
|
// Regression test for #18937.
use std::fmt;
#[derive(Debug)]
struct MyString<'a>(&'a String);
struct B {
list: Vec<Box<dyn fmt::Debug>>,
}
trait A<'a> {
fn foo<F>(&mut self, f: F)
where F: fmt::Debug + 'a,
Self: Sized;
}
impl<'a> A<'a> for B {
fn foo<F>(&mut self, f: F)
where F: fmt::Debug + 'static, //~ ERROR impl has stricter
{
self.list.push(Box::new(f));
}
}
fn main() {
let mut b = B { list: Vec::new() };
// Create a borrowed pointer, put it in `b`, then drop what's borrowing it
let a = "hello".to_string();
b.foo(MyString(&a));
// Drop the data which `b` has a reference to
drop(a);
// Use the data, probably segfaulting
for b in b.list.iter() {
println!("{:?}", b);
}
}
|
