--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/template/pr59930-1.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,18 @@
+// PR c++/59930
+
+namespace N {
+  template<typename T> class A {
+    // The injected name is N::B, because we don;t look outside of N
+    template<typename U> friend struct B;
+  private:
+    int n; // { dg-message "declared private here" }
+  public:
+    A (int);
+  };
+}
+
+template<typename T> struct B {
+  int f(N::A<int> ai) { return ai.n; } // { dg-error "is private" }
+};
+
+int k = B<int>().f(0);