mirror of https://github.com/rust-lang/rust
31 lines
792 B
Rust
31 lines
792 B
Rust
//@ needs-threads
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//@ dont-check-compiler-stderr
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#![feature(cfg_target_thread_local, thread_local_internals)]
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// On platforms *without* `#[thread_local]`, use
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// a custom non-`Sync` type to fake the same error.
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#[cfg(not(target_thread_local))]
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struct Key<T> {
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_data: std::cell::UnsafeCell<Option<T>>,
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_flag: std::cell::Cell<()>,
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}
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#[cfg(not(target_thread_local))]
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impl<T> Key<T> {
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const fn new() -> Self {
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Key {
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_data: std::cell::UnsafeCell::new(None),
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_flag: std::cell::Cell::new(()),
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}
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}
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}
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#[cfg(target_thread_local)]
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use std::thread::local_impl::Key;
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static __KEY: Key<()> = Key::new();
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//~^ ERROR `UnsafeCell<Option<()>>` cannot be shared between threads
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//~| ERROR cannot be shared between threads safely [E0277]
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fn main() {}
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