--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp0x/attributes-namespace3.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,33 @@
+// PR c++/79817 - attribute deprecated on namespace.
+// { dg-do compile { target c++11 } }
+
+namespace [[deprecated]] N
+{
+  typedef decltype(sizeof(int)) T;
+  int x;
+
+  namespace N2 {
+    typedef decltype(sizeof(int)) T;
+    int y;
+  }
+}
+
+namespace M {
+  namespace [[deprecated]] M2 {
+    typedef decltype(sizeof(int)) T;
+    int z;
+  }
+}
+
+void
+fn2 ()
+{
+  using N::x; // { dg-warning ".N. is deprecated" }
+  N::T j; // { dg-warning ".N. is deprecated" }
+
+  using M::M2::z; // { dg-warning ".M::M2. is deprecated" }
+  M::M2::T l; // { dg-warning ".M::M2. is deprecated" }
+
+  using N::N2::y; // { dg-warning ".N. is deprecated" }
+  N::N2::T k; // { dg-warning ".N. is deprecated" }
+}