1 files changed, 17 insertions, 0 deletions
diff --git a/clang/test/Modules/GH155028-1.cpp b/clang/test/Modules/GH155028-1.cpp
new file mode 100644
index 000000000000..d60112b48c21
--- /dev/null
+++ b/clang/test/Modules/GH155028-1.cpp
@@ -0,0 +1,17 @@
+// RUN: %clang_cc1 -std=c++20 -verify %s
+// expected-no-diagnostics
+
+#pragma clang module build M
+module "M" {
+  module "A" {}
+  module "B" {}
+}
+#pragma clang module contents
+#pragma clang module begin M.A
+enum E1 {};
+#pragma clang module end
+#pragma clang module begin M.B
+enum E1 {};
+using T = __underlying_type(E1);
+#pragma clang module end
+#pragma clang module endbuild