40 lines
1.3 KiB
Rust
40 lines
1.3 KiB
Rust
// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(const_fn)]
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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<bool>,
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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(false),
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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::__FastLocalKeyInner as Key;
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static __KEY: Key<()> = Key::new();
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//~^ ERROR `std::cell::UnsafeCell<std::option::Option<()>>` cannot be shared between threads
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//~| ERROR `std::cell::Cell<bool>` cannot be shared between threads safely [E0277]
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fn main() {}
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