3 files changed, 95 insertions, 0 deletions
diff --git a/test/Modules/Inputs/merge-using-decls/a.h b/test/Modules/Inputs/merge-using-decls/a.h
new file mode 100644
index 0000000..0fe0067
--- /dev/null
+++ b/test/Modules/Inputs/merge-using-decls/a.h
@@ -0,0 +1,43 @@
+struct X {
+  int v;
+  typedef int t;
+};
+
+struct YA {
+  int value;
+  typedef int type;
+};
+
+template<typename T> struct C : X, T {
+  using T::value;
+  using typename T::type;
+  using X::v;
+  using typename X::t;
+};
+
+template<typename T> struct D : X, T {
+  using T::value;
+  using typename T::type;
+  using X::v;
+  using typename X::t;
+};
+
+template<typename T> struct E : X, T {
+  using T::value;
+  using typename T::type;
+  using X::v;
+  using typename X::t;
+};
+
+template<typename T> struct F : X, T {
+  using T::value;
+  using typename T::type;
+  using X::v;
+  using typename X::t;
+};
+
+// Force instantiation.
+typedef C<YA>::type I;
+typedef D<YA>::type I;
+typedef E<YA>::type I;
+typedef F<YA>::type I;
diff --git a/test/Modules/Inputs/merge-using-decls/b.h b/test/Modules/Inputs/merge-using-decls/b.h
new file mode 100644
index 0000000..3595555
--- /dev/null
+++ b/test/Modules/Inputs/merge-using-decls/b.h
@@ -0,0 +1,50 @@
+struct X {
+  int v;
+  typedef int t;
+};
+
+struct YB {
+  typedef YB Y;
+  int value;
+  typedef int type;
+};
+
+struct YBRev {
+  typedef int value;
+  int type;
+};
+
+template<typename T> struct C : X, T {
+  using T::value;
+  using typename T::type;
+  using X::v;
+  using typename X::t;
+};
+
+template<typename T> struct D : X, T {
+  // Mismatch in type/non-type-ness.
+  using typename T::value;
+  using T::type;
+  using X::v;
+  using typename X::t;
+};
+
+template<typename T> struct E : X, T {
+  // Mismatch in using/access-declaration-ness.
+  T::value;
+  X::v;
+};
+
+template<typename T> struct F : X, T {
+  // Mismatch in nested-name-specifier.
+  using T::Y::value;
+  using typename T::Y::type;
+  using ::X::v;
+  using typename ::X::t;
+};
+
+// Force instantiation.
+typedef C<YB>::type I;
+typedef D<YBRev>::t I;
+typedef E<YB>::type I;
+typedef F<YB>::type I;
diff --git a/test/Modules/Inputs/merge-using-decls/module.modulemap b/test/Modules/Inputs/merge-using-decls/module.modulemap
new file mode 100644
index 0000000..a415527
--- /dev/null
+++ b/test/Modules/Inputs/merge-using-decls/module.modulemap
@@ -0,0 +1,2 @@
+module A { header "a.h" }
+module B { header "b.h" }