1 files changed, 18 insertions, 0 deletions
diff --git a/src/test/ui/extern/extern-types-not-sync-send.rs b/src/test/ui/extern/extern-types-not-sync-send.rs
new file mode 100644
index 000000000..ba82caced
--- /dev/null
+++ b/src/test/ui/extern/extern-types-not-sync-send.rs
@@ -0,0 +1,18 @@
+// Make sure extern types are !Sync and !Send.
+
+#![feature(extern_types)]
+
+extern "C" {
+    type A;
+}
+
+fn assert_sync<T: ?Sized + Sync>() {}
+fn assert_send<T: ?Sized + Send>() {}
+
+fn main() {
+    assert_sync::<A>();
+    //~^ ERROR `A` cannot be shared between threads safely [E0277]
+
+    assert_send::<A>();
+    //~^ ERROR `A` cannot be sent between threads safely [E0277]
+}