1 files changed, 14 insertions, 0 deletions
diff --git a/test/SemaTemplate/deduction.cpp b/test/SemaTemplate/deduction.cpp
index c089573a9c..e9422898c0 100644
--- a/test/SemaTemplate/deduction.cpp
+++ b/test/SemaTemplate/deduction.cpp
@@ -178,3 +178,17 @@ namespace PR21536 {
   template<typename ...T> void f(S<T...>);
   void g() { f(S<int, int>()); }
 }
+
+namespace PR19372 {
+  template <template<typename...> class C, typename ...Us> struct BindBack {
+    template <typename ...Ts> using apply = C<Ts..., Us...>;
+  };
+  template <typename, typename...> struct Y;
+  template <typename ...Ts> using Z = Y<Ts...>;
+
+  using T = BindBack<Z, int>::apply<>;
+  using T = Z<int>;
+
+  using U = BindBack<Z, int, int>::apply<char>;
+  using U = Z<char, int, int>;
+}