| #![feature(cfg_target_thread_local, thread_local_internals)] |
| |
| // On platforms *without* `#[thread_local]`, use |
| // a custom non-`Sync` type to fake the same error. |
| #[cfg(not(target_thread_local))] |
| struct Key<T> { |
| _data: std::cell::UnsafeCell<Option<T>>, |
| _flag: std::cell::Cell<()>, |
| } |
| |
| #[cfg(not(target_thread_local))] |
| impl<T> Key<T> { |
| const fn new() -> Self { |
| Key { |
| _data: std::cell::UnsafeCell::new(None), |
| _flag: std::cell::Cell::new(()), |
| } |
| } |
| } |
| |
| #[cfg(target_thread_local)] |
| use std::thread::__FastLocalKeyInner as Key; |
| |
| static __KEY: Key<()> = Key::new(); |
| //~^ ERROR `std::cell::UnsafeCell<std::option::Option<()>>` cannot be shared between threads |
| //~| ERROR cannot be shared between threads safely [E0277] |
| |
| fn main() {} |