1 files changed, 8 insertions, 0 deletions
diff --git a/clang/test/CodeGenCXX/mangle-subst-std.cpp b/clang/test/CodeGenCXX/mangle-subst-std.cpp
index 8a410b8b049..a2994c4abf2 100644
--- a/clang/test/CodeGenCXX/mangle-subst-std.cpp
+++ b/clang/test/CodeGenCXX/mangle-subst-std.cpp
@@ -32,12 +32,20 @@ namespace std {
 void f(std::string) { }
 
 namespace std {
+  template<typename, typename> struct basic_istream { };
   template<typename, typename> struct basic_ostream { };
+  template<typename, typename> struct basic_iostream { };
 }
 
+// CHECK: _Z1fSi
+void f(std::basic_istream<char, std::char_traits<char> >) { }
+
 // CHECK: _Z1fSo
 void f(std::basic_ostream<char, std::char_traits<char> >) { }
 
+// CHECK: _Z1fSd
+void f(std::basic_iostream<char, std::char_traits<char> >) { }
+
 extern "C++" {
 namespace std
 {