1 files changed, 30 insertions, 0 deletions
diff --git a/src/test/ui/threads-sendsync/issue-43733-2.rs b/src/test/ui/threads-sendsync/issue-43733-2.rs
new file mode 100644
index 000000000..21ea8e9a2
--- /dev/null
+++ b/src/test/ui/threads-sendsync/issue-43733-2.rs
@@ -0,0 +1,30 @@
+// 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::__FastLocalKeyInner as Key;
+
+static __KEY: Key<()> = Key::new();
+//~^ ERROR `UnsafeCell<Option<()>>` cannot be shared between threads
+//~| ERROR cannot be shared between threads safely [E0277]
+
+fn main() {}