--- dds-xtypes-rtf4_typeobject_issue-36_52.idl	2025-08-28 17:57:20
+++ dds-xtypes-rtf4_typeobject_issue-36_52_68.idl	2025-08-28 17:59:16
@@ -269,11 +269,12 @@
     //     This means the TypeIdentifier is the same for both relationships
     // 
     @extensibility(FINAL) @nested
-    union TypeIdentifier switch (octet) { 
+    struct EmptyStruct {};
+
+    @extensibility(FINAL) @nested
+    union TypeIdentifier switch (octet) {
         // ============  Primitive types - use TypeKind ====================
         // All primitive types fall here. 
-        // Commented-out because Unions cannot have cases with no member.
-        /*
         case TK_NONE:
         case TK_BOOLEAN:       
         case TK_BYTE_TYPE:
@@ -290,8 +291,7 @@
         case TK_FLOAT128_TYPE:        
         case TK_CHAR8_TYPE:
         case TK_CHAR16_TYPE:
-            // No Value
-        */
+            EmptyStruct unused; 
 
         // ============ Strings - use TypeIdentifierKind ===================
         case TI_STRING8_SMALL: