diff --git a/clang/test/CXX/drs/dr2390.cpp b/clang/test/CXX/drs/dr2390.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/CXX/drs/dr2390.cpp
@@ -0,0 +1,47 @@
+// RUN: %clang_cc1 -E -P %s -o - | FileCheck %s
+
+// dr2390: yes
+
+namespace PR48462 {
+// Test that macro expansion of the builtin argument works.
+#define C clang
+#define F fallthrough
+#define CF clang::fallthrough
+
+#if __has_cpp_attribute(F)
+int has_fallthrough;
+#endif
+// CHECK: int has_fallthrough;
+
+#if __has_cpp_attribute(C::F)
+int has_clang_fallthrough_1;
+#endif
+// CHECK: int has_clang_fallthrough_1;
+
+#if __has_cpp_attribute(clang::F)
+int has_clang_fallthrough_2;
+#endif
+// CHECK: int has_clang_fallthrough_2;
+
+#if __has_cpp_attribute(C::fallthrough)
+int has_clang_fallthrough_3;
+#endif
+// CHECK: int has_clang_fallthrough_3;
+
+#if __has_cpp_attribute(CF)
+int has_clang_fallthrough_4;
+#endif
+// CHECK: int has_clang_fallthrough_4;
+
+#define FUNCLIKE1(x) clang::x
+#if __has_cpp_attribute(FUNCLIKE1(fallthrough))
+int funclike_1;
+#endif
+// CHECK: int funclike_1;
+
+#define FUNCLIKE2(x) _Clang::x
+#if __has_cpp_attribute(FUNCLIKE2(fallthrough))
+int funclike_2;
+#endif
+// CHECK: int funclike_2;
+} // namespace PR48462