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diff --git a/libstdc++-v3/include/ext/pb_ds/detail/rb_tree_map_/debug_fn_imps.hpp b/libstdc++-v3/include/ext/pb_ds/detail/rb_tree_map_/debug_fn_imps.hpp
new file mode 100644
index 00000000..18ecc423
--- /dev/null
+++ b/libstdc++-v3/include/ext/pb_ds/detail/rb_tree_map_/debug_fn_imps.hpp
@@ -0,0 +1,78 @@
+// -*- C++ -*-
+
+// Copyright (C) 2005, 2006, 2009 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.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
+
+// Permission to use, copy, modify, sell, and distribute this software
+// is hereby granted without fee, provided that the above copyright
+// notice appears in all copies, and that both that copyright notice
+// and this permission notice appear in supporting documentation. None
+// of the above authors, nor IBM Haifa Research Laboratories, make any
+// representation about the suitability of this software for any
+// purpose. It is provided "as is" without express or implied
+// warranty.
+
+/**
+ * @file debug_fn_imps.hpp
+ * Contains an implementation for rb_tree_.
+ */
+
+#ifdef _GLIBCXX_DEBUG
+
+PB_DS_CLASS_T_DEC
+typename PB_DS_CLASS_C_DEC::size_type
+PB_DS_CLASS_C_DEC::
+assert_node_consistent(const node_pointer p_nd) const
+{
+  if (p_nd == NULL)
+    return 1;
+
+  const size_type l_height = assert_node_consistent(p_nd->m_p_left);
+  const size_type r_height = assert_node_consistent(p_nd->m_p_right);
+  if (p_nd->m_red)
+    {
+      _GLIBCXX_DEBUG_ASSERT(is_effectively_black(p_nd->m_p_left));
+      _GLIBCXX_DEBUG_ASSERT(is_effectively_black(p_nd->m_p_right));
+    }
+  _GLIBCXX_DEBUG_ASSERT(l_height == r_height);
+  return (p_nd->m_red ? 0 : 1) + l_height;
+}
+
+PB_DS_CLASS_T_DEC
+void
+PB_DS_CLASS_C_DEC::
+assert_valid() const
+{
+  base_type::assert_valid();
+  const node_pointer p_head = base_type::m_p_head;
+  _GLIBCXX_DEBUG_ASSERT(p_head->m_red);
+  if (p_head->m_p_parent != NULL)
+    {
+      _GLIBCXX_DEBUG_ASSERT(!p_head->m_p_parent->m_red);
+      assert_node_consistent(p_head->m_p_parent);
+    }
+}
+
+#endif 
+