1 files changed, 38 insertions, 0 deletions
diff --git a/clang/test/SemaTemplate/ackermann.cpp b/clang/test/SemaTemplate/ackermann.cpp
new file mode 100644
index 0000000..9525bfc
--- /dev/null
+++ b/clang/test/SemaTemplate/ackermann.cpp
@@ -0,0 +1,38 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+// template<unsigned M, unsigned N>
+// struct Ackermann {
+//   enum {
+//     value = M ? (N ? Ackermann<M-1, Ackermann<M, N-1> >::value
+//                    : Ackermann<M-1, 1>::value)
+//               : N + 1
+//   };
+// };
+
+template<unsigned M, unsigned N>
+struct Ackermann {
+ enum {
+   value = Ackermann<M-1, Ackermann<M, N-1>::value >::value
+ };
+};
+
+template<unsigned M> struct Ackermann<M, 0> {
+ enum {
+   value = Ackermann<M-1, 1>::value
+ };
+};
+
+template<unsigned N> struct Ackermann<0, N> {
+ enum {
+   value = N + 1
+ };
+};
+
+template<> struct Ackermann<0, 0> {
+ enum {
+   value = 1
+ };
+};
+
+int g0[Ackermann<3, 4>::value == 125 ? 1 : -1];
+