1 files changed, 40 insertions, 0 deletions
diff --git a/clang/test/SemaCXX/constant-expression-cxx1y.cpp b/clang/test/SemaCXX/constant-expression-cxx1y.cpp
index 40a98d4ca9f..af44bf8d744 100644
--- a/clang/test/SemaCXX/constant-expression-cxx1y.cpp
+++ b/clang/test/SemaCXX/constant-expression-cxx1y.cpp
@@ -725,3 +725,43 @@ namespace modify_temporary_during_construction {
   static_assert(a.y == 54, "");
   constexpr int k = a.temporary++; // expected-error {{constant expression}} expected-note {{outside the expression that created the temporary}}
 }
+
+namespace std {
+  typedef decltype(sizeof(int)) size_t;
+
+  template <class _E>
+  class initializer_list
+  {
+    const _E* __begin_;
+    size_t    __size_;
+
+    constexpr initializer_list(const _E* __b, size_t __s)
+      : __begin_(__b),
+        __size_(__s)
+    {}
+
+  public:
+    typedef _E        value_type;
+    typedef const _E& reference;
+    typedef const _E& const_reference;
+    typedef size_t    size_type;
+
+    typedef const _E* iterator;
+    typedef const _E* const_iterator;
+
+    constexpr initializer_list() : __begin_(nullptr), __size_(0) {}
+
+    constexpr size_t    size()  const {return __size_;}
+    constexpr const _E* begin() const {return __begin_;}
+    constexpr const _E* end()   const {return __begin_ + __size_;}
+  };
+}
+
+namespace InitializerList {
+  constexpr int sum(std::initializer_list<int> ints) {
+    int total = 0;
+    for (int n : ints) total += n;
+    return total;
+  }
+  static_assert(sum({1, 2, 3, 4, 5}) == 15, "");
+}