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

   1 // Copyright 2017 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 #![feature(const_fn)]
  12 #![feature(thread_local)]
  13 #![feature(cfg_target_thread_local, thread_local_internals)]
  14
  15 type Foo = std::cell::RefCell<String>;
  16
  17 #[cfg(target_thread_local)]
  18 #[thread_local]
  19 static __KEY: std::thread::__FastLocalKeyInner<Foo> =
  20     std::thread::__FastLocalKeyInner::new();
  21
  22 #[cfg(not(target_thread_local))]
  23 static __KEY: std::thread::__OsLocalKeyInner<Foo> =
  24     std::thread::__OsLocalKeyInner::new();
  25
  26 fn __getit() -> std::option::Option<
  27     &'static std::cell::UnsafeCell<
  28         std::option::Option<Foo>>>
  29 {
  30     __KEY.get() //~ ERROR call to unsafe function is unsafe
  31 }
  32
  33 static FOO: std::thread::LocalKey<Foo> =
  34     std::thread::LocalKey::new(__getit, Default::default);
  35 //~^ ERROR call to unsafe function is unsafe
  36
  37 fn main() {
  38     FOO.with(|foo| println!("{}", foo.borrow()));
  39     std::thread::spawn(|| {
  40         FOO.with(|foo| *foo.borrow_mut() += "foo");
  41     }).join().unwrap();
  42     FOO.with(|foo| println!("{}", foo.borrow()));
  43 }