4 files changed, 27 insertions, 0 deletions
diff --git a/clang/test/Modules/Inputs/cxx-templates-a.h b/clang/test/Modules/Inputs/cxx-templates-a.h
index 0ca6e34d0bc..0b1614d3d9e 100644
--- a/clang/test/Modules/Inputs/cxx-templates-a.h
+++ b/clang/test/Modules/Inputs/cxx-templates-a.h
@@ -40,3 +40,11 @@ const auto enum_c_from_a = CommonTemplate<int>::c;
 template<int> struct UseInt;
 template<typename T> void UseRedeclaredEnum(UseInt<T() + CommonTemplate<char>::a>);
 constexpr void (*UseRedeclaredEnumA)(UseInt<1>) = UseRedeclaredEnum<int>;
+
+template<typename> struct MergeSpecializations;
+template<typename T> struct MergeSpecializations<T*> {
+  typedef int partially_specialized_in_a;
+};
+template<> struct MergeSpecializations<char> {
+  typedef int explicitly_specialized_in_a;
+};
diff --git a/clang/test/Modules/Inputs/cxx-templates-b.h b/clang/test/Modules/Inputs/cxx-templates-b.h
index f0921a7e0b2..6cd83faf1a1 100644
--- a/clang/test/Modules/Inputs/cxx-templates-b.h
+++ b/clang/test/Modules/Inputs/cxx-templates-b.h
@@ -51,6 +51,14 @@ template<int> struct UseInt;
 template<typename T> void UseRedeclaredEnum(UseInt<T() + CommonTemplate<char>::a>);
 constexpr void (*UseRedeclaredEnumB)(UseInt<1>) = UseRedeclaredEnum<int>;
 
+template<typename> struct MergeSpecializations;
+template<typename T> struct MergeSpecializations<T&> {
+  typedef int partially_specialized_in_b;
+};
+template<> struct MergeSpecializations<double> {
+  typedef int explicitly_specialized_in_b;
+};
+
 @import cxx_templates_a;
 template<typename T> void UseDefinedInBImplIndirectly(T &v) {
   PerformDelayedLookup(v);
diff --git a/clang/test/Modules/Inputs/cxx-templates-c.h b/clang/test/Modules/Inputs/cxx-templates-c.h
new file mode 100644
index 00000000000..4c0fc8a4a82
--- /dev/null
+++ b/clang/test/Modules/Inputs/cxx-templates-c.h
@@ -0,0 +1,7 @@
+template<typename> struct MergeSpecializations;
+template<typename T> struct MergeSpecializations<T[]> {
+  typedef int partially_specialized_in_c;
+};
+template<> struct MergeSpecializations<bool> {
+  typedef int explicitly_specialized_in_c;
+};
diff --git a/clang/test/Modules/Inputs/module.map b/clang/test/Modules/Inputs/module.map
index ac3543b6440..7534eb253d7 100644
--- a/clang/test/Modules/Inputs/module.map
+++ b/clang/test/Modules/Inputs/module.map
@@ -204,6 +204,10 @@ module cxx_templates_b {
   header "cxx-templates-b.h"
 }
 
+module cxx_templates_c {
+  header "cxx-templates-c.h"
+}
+
 module cxx_decls {
   module unimported {
     header "cxx-decls-unimported.h"