--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/coroutines/pr94752.C	Mon May 25 07:50:57 2020 +0900
@@ -0,0 +1,20 @@
+//  { dg-additional-options  "-w" }
+
+#include "coro.h"
+
+using namespace std;
+
+struct task {
+    struct promise_type {
+        promise_type() {}
+        task get_return_object() { return {}; }
+        suspend_never initial_suspend() { return {}; }
+        suspend_never final_suspend() { return {}; }
+        void return_void() {}
+        void unhandled_exception() {}
+    };
+};
+
+task foo(int) {
+    co_return;
+}