mirror of
https://github.com/rust-lang/rust.git
synced 2024-10-30 22:12:15 +00:00
31 lines
790 B
Rust
31 lines
790 B
Rust
// ignore-wasm32
|
|
// dont-check-compiler-stderr
|
|
#![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::local_impl::Key;
|
|
|
|
static __KEY: Key<()> = Key::new();
|
|
//~^ ERROR `UnsafeCell<Option<()>>` cannot be shared between threads
|
|
//~| ERROR cannot be shared between threads safely [E0277]
|
|
|
|
fn main() {}
|