Add a test for iter::empty::<*mut i32> being Sync and Send

KamilaBorowska · KamilaBorowska · commit d7a18f89864a · 2020-01-18T18:50:10.000+01:00
diff --git a/src/test/ui/threads-sendsync/sync-send-iterators-in-libcore.rs b/src/test/ui/threads-sendsync/sync-send-iterators-in-libcore.rs
@@ -88,6 +88,7 @@ fn main() {
     is_sync_send!((1..));
     is_sync_send!(repeat(1));
     is_sync_send!(empty::<usize>());
+    is_sync_send!(empty::<*mut i32>());
     is_sync_send!(once(1));
 
     // for option.rs
