tests/ui/mir/field-projection-mutating-context2.rs

   1 use std::sync::Mutex;
   2
   3 static GLOBAL: Mutex<&'static str> = Mutex::new("global str");
   4
   5 struct Foo<T>(T); // `T` is covariant.
   6
   7 fn foo<'a>(mut x: Foo<fn(&'a str)>, string: &'a str) {
   8     let Foo(ref mut y): Foo<fn(&'static str)> = x;
   9     //~^ ERROR lifetime may not live long enough
  10     *y = |s| *GLOBAL.lock().unwrap() = s;
  11     (x.0)(&string);
  12 }
  13
  14 fn main() {
  15     foo(Foo(|_| ()), &String::from("i am shortlived"));
  16     println!("{}", GLOBAL.lock().unwrap());
  17 }