| use std::any::Any; |
| |
| #[derive(Debug, Clone)] |
| struct S<T: 'static>(T); |
| |
| // S<&'a T> is in the return type, so we get an implied bound |
| // &'a T: 'static |
| fn foo<'a, T>(x: &'a T) -> (S<&'a T>, Box<dyn Any + 'static>) { |
| let y = S(x); |
| |
| let z = Box::new(y.clone()) as Box<dyn Any + 'static>; |
| (y, z) |
| } |
| |
| fn main() { |
| let x = 5; |
| |
| // Check that we require that the argument is of type `&'static String`, |
| // so that the return type is well-formed. |
| let (_, z) = foo(&"hello".to_string()); |
| //~^ ERROR temporary value dropped while borrowed |
| |
| println!("{:?}", z.downcast_ref::<S<&'static String>>()); |
| } |
