--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/lookup/friend10.C	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,22 @@
+// PR c++/18681
+// Bug: The friend declaration in A failed to give C::D access to A::B
+// as specified in DR 45.
+
+class A
+{
+  struct B;
+  friend class C;
+};
+
+class C
+{
+  struct D
+  {
+    void f();
+  };
+};
+
+void C::D::f()
+{
+  A::B* p;
+}