src/test/ui/issues/issue-43733.rs

   1 #![feature(const_fn)]
   2 #![feature(thread_local)]
   3 #![feature(cfg_target_thread_local, thread_local_internals)]
   4
   5 type Foo = std::cell::RefCell<String>;
   6
   7 #[cfg(target_thread_local)]
   8 #[thread_local]
   9 static __KEY: std::thread::__FastLocalKeyInner<Foo> =
  10     std::thread::__FastLocalKeyInner::new();
  11
  12 #[cfg(not(target_thread_local))]
  13 static __KEY: std::thread::__OsLocalKeyInner<Foo> =
  14     std::thread::__OsLocalKeyInner::new();
  15
  16 fn __getit() -> std::option::Option<&'static Foo>
  17 {
  18     __KEY.get(Default::default) //~ ERROR call to unsafe function is unsafe
  19 }
  20
  21 static FOO: std::thread::LocalKey<Foo> =
  22     std::thread::LocalKey::new(__getit);
  23 //~^ ERROR call to unsafe function is unsafe
  24
  25 fn main() {
  26     FOO.with(|foo| println!("{}", foo.borrow()));
  27     std::thread::spawn(|| {
  28         FOO.with(|foo| *foo.borrow_mut() += "foo");
  29     }).join().unwrap();
  30     FOO.with(|foo| println!("{}", foo.borrow()));
  31 }