[pushed] c++: add fixed test [PR119378]

[Patrick Palka]

Fixed by r15-123 (specifically the change to set processing_template_decl
when tsubsting UNBOUND_CLASS_TEMPLATE).

        PR c++/119378

gcc/testsuite/ChangeLog:

        * g++.dg/template/friend85.C: New test.
---
 gcc/testsuite/g++.dg/template/friend85.C | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/template/friend85.C

diff --git a/gcc/testsuite/g++.dg/template/friend85.C 
b/gcc/testsuite/g++.dg/template/friend85.C
new file mode 100644
index 00000000000..5cf83911193
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/friend85.C
@@ -0,0 +1,16 @@
+// PR c++/119378
+
+template<int N>
+struct A {
+  template<class T>
+  struct B;
+};
+
+template<class U>
+struct C {
+  template<int N>
+  template<class T>
+  friend class A<N>::B;
+};
+
+template struct C<int>;
-- 
2.49.0.rc1.37.ge969bc8759