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// 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);
}
}
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