1 files changed, 33 insertions, 0 deletions
diff --git a/test/Modules/merge-deduced-return.cpp b/test/Modules/merge-deduced-return.cpp
new file mode 100644
index 0000000000000..0a4de7b975545
--- /dev/null
+++ b/test/Modules/merge-deduced-return.cpp
@@ -0,0 +1,33 @@
+// RUN: %clang_cc1 -fmodules -std=c++17 -verify %s
+// RUN: %clang_cc1 -fmodules -std=c++17 -verify %s -DLOCAL
+// expected-no-diagnostics
+
+#pragma clang module build A
+module A {}
+#pragma clang module contents
+#pragma clang module begin A
+inline auto f() { struct X {}; return X(); }
+inline auto a = f();
+#pragma clang module end
+#pragma clang module endbuild
+
+#pragma clang module build B
+module B {}
+#pragma clang module contents
+#pragma clang module begin B
+inline auto f() { struct X {}; return X(); }
+inline auto b = f();
+#pragma clang module end
+#pragma clang module endbuild
+
+#ifdef LOCAL
+inline auto f() { struct X {}; return X(); }
+inline auto b = f();
+#else
+#pragma clang module import B
+#endif
+
+#pragma clang module import A
+
+using T = decltype(a);
+using T = decltype(b);