c++: &enum::enumerator [PR101869]

We don't want to call build_offset_ref with an enum.

	PR c++/101869

gcc/cp/ChangeLog:

	* semantics.cc (finish_qualified_id_expr): Don't try to build a
	pointer-to-member if the scope is an enumeration.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp0x/enum43.C: New test.

gcc/cp/semantics.cc

@@ -2386,7 +2386,8 @@ finish_qualified_id_expr (tree qualifying_class,
 
   /* If EXPR occurs as the operand of '&', use special handling that
      permits a pointer-to-member.  */
-  if (address_p && done)
+  if (address_p && done
+      && TREE_CODE (qualifying_class) != ENUMERAL_TYPE)
     {
       if (TREE_CODE (expr) == SCOPE_REF)
 	expr = TREE_OPERAND (expr, 1);

gcc/testsuite/g++.dg/cpp0x/enum43.C

@@ -0,0 +1,11 @@
+// PR c++/101869
+
+enum E { A };
+E operator & (E e)
+{
+  return e;
+}
+E f(void)
+{
+    return &E::A;	 // { dg-error "not a class" "" { target c++98_only } }
+}