--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gdc.dg/pr92309.d	Mon May 25 07:50:57 2020 +0900
@@ -0,0 +1,25 @@
+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92309
+// { dg-do run { target hw } }
+// { dg-skip-if "needs gcc/config.d" { ! d_runtime } }
+
+union U
+{
+    struct
+    {
+        size_t a;
+        size_t b;
+        union
+        {
+            size_t c;
+            size_t d;
+        }
+    }
+}
+
+void main()
+{
+    U u;
+    assert(u.a == 0);
+    u.d = 1;
+    assert(u.a == 0);
+}