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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() {
let mut x: Foo<for<'a> fn(&'a str)> = Foo(|_| ());
let Foo(ref mut y): Foo<fn(&'static str)> = x;
//~^ ERROR mismatched types
*y = |s| *GLOBAL.lock().unwrap() = s;
let string = String::from("i am shortlived");
(x.0)(&string);
}
fn main() {
foo();
println!("{}", GLOBAL.lock().unwrap());
}
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