1 files changed, 31 insertions, 0 deletions
diff --git a/gcc/testsuite/gdc.test/runnable/test20603.d b/gcc/testsuite/gdc.test/runnable/test20603.d
new file mode 100644
index 00000000000..47fd3985555
--- /dev/null
+++ b/gcc/testsuite/gdc.test/runnable/test20603.d
@@ -0,0 +1,31 @@
+// https://issues.dlang.org/show_bug.cgi?id=20603
+
+enum immutable(int)* x = new int(3);
+enum const(int)* y = new int(5);
+
+struct Base {
+    union {
+        int overlap;
+        immutable(Sub)* sub;
+    }
+
+    this(Sub) {
+        sub = new Sub;
+    }
+}
+
+struct Sub {
+    Base base;
+}
+
+immutable c0 = Base(Sub.init);
+
+void main()
+{
+    enum const(int)* z = new int(9);
+
+    assert(*x == 3);
+    assert(*y == 5);
+    assert(*z == 9);
+    assert(c0.sub.base.sub == null);
+}