| // 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) //~ ERROR impl has stricter |
| where F: fmt::Debug + 'static, |
| { |
| 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); |
| } |
| } |