src/test/compile-fail/issue-43733-2.rs

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