| #![feature(const_fn)] |
| #![feature(thread_local)] |
| #![feature(cfg_target_thread_local, thread_local_internals)] |
| |
| type Foo = std::cell::RefCell<String>; |
| |
| #[cfg(target_thread_local)] |
| #[thread_local] |
| static __KEY: std::thread::__FastLocalKeyInner<Foo> = |
| std::thread::__FastLocalKeyInner::new(); |
| |
| #[cfg(not(target_thread_local))] |
| static __KEY: std::thread::__OsLocalKeyInner<Foo> = |
| std::thread::__OsLocalKeyInner::new(); |
| |
| fn __getit() -> std::option::Option<&'static Foo> |
| { |
| __KEY.get(Default::default) //~ ERROR call to unsafe function is unsafe |
| } |
| |
| static FOO: std::thread::LocalKey<Foo> = |
| std::thread::LocalKey::new(__getit); |
| //~^ ERROR call to unsafe function is unsafe |
| |
| fn main() { |
| FOO.with(|foo| println!("{}", foo.borrow())); |
| std::thread::spawn(|| { |
| FOO.with(|foo| *foo.borrow_mut() += "foo"); |
| }).join().unwrap(); |
| FOO.with(|foo| println!("{}", foo.borrow())); |
| } |
