1 files changed, 38 insertions, 0 deletions
diff --git a/tests/ui/threads-sendsync/issue-43733.rs b/tests/ui/threads-sendsync/issue-43733.rs
new file mode 100644
index 000000000..935e02944
--- /dev/null
+++ b/tests/ui/threads-sendsync/issue-43733.rs
@@ -0,0 +1,38 @@
+// ignore-wasm32
+// revisions: mir thir
+// [thir]compile-flags: -Z thir-unsafeck
+// normalize-stderr-test: "__FastLocalKeyInner::<T>::get" -> "$$LOCALKEYINNER::<T>::get"
+// normalize-stderr-test: "__OsLocalKeyInner::<T>::get" -> "$$LOCALKEYINNER::<T>::get"
+#![feature(thread_local)]
+#![feature(cfg_target_thread_local, thread_local_internals)]
+
+use std::cell::RefCell;
+
+type Foo = std::cell::RefCell<String>;
+
+#[cfg(target_thread_local)]
+#[thread_local]
+static __KEY: std::thread::__FastLocalKeyInner<Foo> = std::thread::__FastLocalKeyInner::new();
+
+#[cfg(not(target_thread_local))]
+static __KEY: std::thread::__OsLocalKeyInner<Foo> = std::thread::__OsLocalKeyInner::new();
+
+fn __getit(_: Option<&mut Option<RefCell<String>>>) -> std::option::Option<&'static Foo> {
+    __KEY.get(Default::default)
+    //[mir]~^ ERROR call to unsafe function is unsafe
+    //[thir]~^^ ERROR call to unsafe function `__
+}
+
+static FOO: std::thread::LocalKey<Foo> = std::thread::LocalKey::new(__getit);
+//[mir]~^ ERROR call to unsafe function is unsafe
+//[thir]~^^ ERROR call to unsafe function `LocalKey::<T>::new`
+
+fn main() {
+    FOO.with(|foo| println!("{}", foo.borrow()));
+    std::thread::spawn(|| {
+        FOO.with(|foo| *foo.borrow_mut() += "foo");
+    })
+    .join()
+    .unwrap();
+    FOO.with(|foo| println!("{}", foo.borrow()));
+}