test added for nested unnamed C struct %extend

Examples/test-suite/nested_extend_c.i

@@ -44,6 +44,13 @@
     return $self->num;
   }
 }
+
+%extend FOO_bar {
+    void bar_extend()	{
+        $self->d = 1;
+    }
+};
+
 #endif
 
 %inline %{
@@ -72,5 +79,13 @@ typedef struct {
         int num;
     } lowB_instance;
 } NestedB;
+
+typedef struct {
+    int a;
+    union {
+        char c;
+        int d;
+    } bar;
+} FOO;
 %}
 

Source/Modules/nested.cxx

@@ -378,8 +378,6 @@ void Swig_nested_name_unnamed_c_structs(Node *n) {
 	  decl = nextSibling(decl);
 	}
 	Delete(ty);
-	// Check for extensions
-	// TODO: we can save extensions hash like class hash and move check_extensions() after nesting processing
 	if (extendhash) {
 	  if (Node *am = Getattr(extendhash, name)) {
 	    // Merge the extension into the symbol table