mirror of https://github.com/rust-lang/rust
18 lines
461 B
Rust
18 lines
461 B
Rust
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());
|
|
}
|