libstdc++: Add already-accepted <ranges> testcase [PR106320]

Although PR106320 affected only the 10 and 11 branches, and the testcase
from there is already correctly accepted on trunk and the 12 branch, we
still should add the testcase to trunk/12 too for inter-branch consistency.

	PR libstdc++/106320

libstdc++-v3/ChangeLog:

	* testsuite/std/ranges/adaptors/join.cc (test13): New test.

(cherry picked from commit db19cfdac8ede93172aecc58612171c239c993ad)

diff --git a/libstdc++-v3/testsuite/std/ranges/adaptors/join.cc b/libstdc++-v3/testsuite/std/ranges/adaptors/join.cc
index 8986f71822963e462bb3d110a5e2309cc8337717..530ab6663b5323f8bd3f3a6d6e628598c10bc5d3 100644 (file)
--- a/libstdc++-v3/testsuite/std/ranges/adaptors/join.cc
+++ b/libstdc++-v3/testsuite/std/ranges/adaptors/join.cc
@@ -205,6 +205,18 @@ test12()
   }();
 }
 
+void
+test13()
+{
+  // PR libstdc++/106320
+  auto l = std::views::transform([](auto x) {
+    return x | std::views::transform([i=0](auto y) {
+      return y;
+    });
+  });
+  std::vector<std::vector<int>> v{{5, 6, 7}};
+  v | l | std::views::join;
+}
 int
 main()
 {
@@ -220,4 +232,5 @@ main()
   test10();
   test11();
   test12();
+  test13();
 }