PR43764: Qualify a couple of calls to forward_as_tuple to be ADL-resilient.

1 files changed, 16 insertions, 0 deletions

diff --git a/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.creation/tuple_cat.pass.cpp b/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.creation/tuple_cat.pass.cpp
index b663a4801fe..2fabeb0a577 100644
--- a/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.creation/tuple_cat.pass.cpp
+++ b/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.creation/tuple_cat.pass.cpp
@@ -23,6 +23,14 @@
 #include "test_macros.h"
 #include "MoveOnly.h"
 
+namespace NS {
+struct Namespaced {
+  int i;
+};
+template<typename ...Ts>
+void forward_as_tuple(Ts...) = delete;
+}
+
 int main(int, char**)
 {
     {
@@ -254,5 +262,13 @@ int main(int, char**)
             int, const int, int&, const int&>);
         ((void)r);
     }
+    {
+        std::tuple<NS::Namespaced> t1({1});
+        std::tuple<NS::Namespaced> t = std::tuple_cat(t1);
+        std::tuple<NS::Namespaced, NS::Namespaced> t2 =
+            std::tuple_cat(t1, t1);
+        assert(std::get<0>(t).i == 1);
+        assert(std::get<0>(t2).i == 1);
+    }
   return 0;
 }