tests/ui/threads-sendsync/issue-43733-2.rs

   1 // ignore-wasm32
   2 // dont-check-compiler-stderr
   3 #![feature(cfg_target_thread_local, thread_local_internals)]
   4
   5 // On platforms *without* `#[thread_local]`, use
   6 // a custom non-`Sync` type to fake the same error.
   7 #[cfg(not(target_thread_local))]
   8 struct Key<T> {
   9     _data: std::cell::UnsafeCell<Option<T>>,
  10     _flag: std::cell::Cell<()>,
  11 }
  12
  13 #[cfg(not(target_thread_local))]
  14 impl<T> Key<T> {
  15     const fn new() -> Self {
  16         Key {
  17             _data: std::cell::UnsafeCell::new(None),
  18             _flag: std::cell::Cell::new(()),
  19         }
  20     }
  21 }
  22
  23 #[cfg(target_thread_local)]
  24 use std::thread::__LocalKeyInner as Key;
  25
  26 static __KEY: Key<()> = Key::new();
  27 //~^ ERROR `UnsafeCell<Option<()>>` cannot be shared between threads
  28 //~| ERROR cannot be shared between threads safely [E0277]
  29
  30 fn main() {}