| use std::sync::Mutex; | |
| static GLOBAL: Mutex<&'static str> = Mutex::new("global str"); | |
| struct Foo<T>(T); // `T` is covariant. | |
| fn foo<'a>(mut x: Foo<fn(&'a str)>, string: &'a str) { | |
| let Foo(ref mut y): Foo<fn(&'static str)> = x; | |
| //~^ ERROR lifetime may not live long enough | |
| *y = |s| *GLOBAL.lock().unwrap() = s; | |
| (x.0)(&string); | |
| } | |
| fn main() { | |
| foo(Foo(|_| ()), &String::from("i am shortlived")); | |
| println!("{}", GLOBAL.lock().unwrap()); | |
| } |