[gcc/devel/ranger] libstdc++: Add test accidentally left out of previous commit

[Aldy Hernandez <aldyh@gcc.gnu.org>]

https://gcc.gnu.org/g:6de946e65c9558515a2c31be76853ae7653d4fc9

commit 6de946e65c9558515a2c31be76853ae7653d4fc9
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Feb 25 12:42:03 2020 +0000

    libstdc++: Add test accidentally left out of previous commit
    
            * testsuite/25_algorithms/move_backward/93872.cc: Add test left out of
            previous commit.

Diff:
---
 libstdc++-v3/ChangeLog                             |  3 ++
 .../testsuite/25_algorithms/move_backward/93872.cc | 39 ++++++++++++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index f14a6e223ea..d7195bdca1c 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,8 @@
 2020-02-24  Jonathan Wakely  <jwakely@redhat.com>
 
+	* testsuite/25_algorithms/move_backward/93872.cc: Add test left out of
+	previous commit.
+
 	PR libstdc++/93872
 	* include/bits/stl_algobase.h (__memmove): Cast away const before
 	doing move assignment.
diff --git a/libstdc++-v3/testsuite/25_algorithms/move_backward/93872.cc b/libstdc++-v3/testsuite/25_algorithms/move_backward/93872.cc
new file mode 100644
index 00000000000..69774fa86c6
--- /dev/null
+++ b/libstdc++-v3/testsuite/25_algorithms/move_backward/93872.cc
@@ -0,0 +1,39 @@
+// Copyright (C) 2020 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+#include <algorithm>
+
+struct X
+{
+  X() = default;
+
+  X(const X&) = delete;
+  X& operator=(const X&) = delete;
+
+  X(X&&) = default;
+  X& operator=(X&&) = default;
+};
+
+void
+test01()
+{
+  X a[2], b[2];
+  std::move_backward(std::begin(a), std::end(a), std::begin(b));
+}