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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());
}
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