1 files changed, 19 insertions, 0 deletions
diff --git a/tests/ui/extern/extern-types-manual-sync-send.rs b/tests/ui/extern/extern-types-manual-sync-send.rs
new file mode 100644
index 000000000..87eb3f622
--- /dev/null
+++ b/tests/ui/extern/extern-types-manual-sync-send.rs
@@ -0,0 +1,19 @@
+// run-pass
+// Test that unsafe impl for Sync/Send can be provided for extern types.
+
+#![feature(extern_types)]
+
+extern "C" {
+    type A;
+}
+
+unsafe impl Sync for A {}
+unsafe impl Send for A {}
+
+fn assert_sync<T: ?Sized + Sync>() {}
+fn assert_send<T: ?Sized + Send>() {}
+
+fn main() {
+    assert_sync::<A>();
+    assert_send::<A>();
+}