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diff --git a/libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/debug_fn_imps.hpp b/libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/debug_fn_imps.hpp
new file mode 100644
index 00000000..de756578
--- /dev/null
+++ b/libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/debug_fn_imps.hpp
@@ -0,0 +1,117 @@
+// -*- 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 class for pat_trie_.
+ */
+
+#ifdef _GLIBCXX_DEBUG
+
+PB_DS_CLASS_T_DEC
+void
+PB_DS_CLASS_C_DEC::
+assert_valid() const
+{
+  if (m_p_head->m_p_parent != NULL)
+    m_p_head->m_p_parent->assert_valid(this);
+  assert_iterators();
+  assert_reverse_iterators();
+  if (m_p_head->m_p_parent == NULL)
+    {
+      _GLIBCXX_DEBUG_ASSERT(m_p_head->m_p_min == m_p_head);
+      _GLIBCXX_DEBUG_ASSERT(m_p_head->m_p_max == m_p_head);
+      _GLIBCXX_DEBUG_ASSERT(empty());
+      return;
+    }
+
+  _GLIBCXX_DEBUG_ASSERT(m_p_head->m_p_min->m_type == pat_trie_leaf_node_type);
+  _GLIBCXX_DEBUG_ASSERT(m_p_head->m_p_max->m_type == pat_trie_leaf_node_type);
+  _GLIBCXX_DEBUG_ASSERT(!empty());
+}
+
+PB_DS_CLASS_T_DEC
+void
+PB_DS_CLASS_C_DEC::
+assert_iterators() const
+{
+  size_type calc_size = 0;
+  for (const_iterator it = begin(); it != end(); ++it)
+    {
+      ++calc_size;
+      debug_base::check_key_exists(PB_DS_V2F(*it));
+      _GLIBCXX_DEBUG_ASSERT(lower_bound(PB_DS_V2F(*it)) == it);
+      _GLIBCXX_DEBUG_ASSERT(--upper_bound(PB_DS_V2F(*it)) == it);
+    }
+  _GLIBCXX_DEBUG_ASSERT(calc_size == m_size);
+}
+
+PB_DS_CLASS_T_DEC
+void
+PB_DS_CLASS_C_DEC::
+assert_reverse_iterators() const
+{
+  size_type calc_size = 0;
+  for (const_reverse_iterator it = rbegin(); it != rend(); ++it)
+    {
+      ++calc_size;
+      const_node_pointer p_nd =
+	const_cast<PB_DS_CLASS_C_DEC* >(this)->find_imp(PB_DS_V2F(*it));
+      _GLIBCXX_DEBUG_ASSERT(p_nd == it.m_p_nd);
+    }
+  _GLIBCXX_DEBUG_ASSERT(calc_size == m_size);
+}
+
+PB_DS_CLASS_T_DEC
+typename PB_DS_CLASS_C_DEC::size_type
+PB_DS_CLASS_C_DEC::
+recursive_count_leafs(const_node_pointer p_nd)
+{
+  if (p_nd == NULL)
+    return (0);
+  if (p_nd->m_type == pat_trie_leaf_node_type)
+    return (1);
+  _GLIBCXX_DEBUG_ASSERT(p_nd->m_type == pat_trie_internal_node_type);
+  size_type ret = 0;
+  for (typename internal_node::const_iterator it =
+	 static_cast<const_internal_node_pointer>(p_nd)->begin();
+       it != static_cast<const_internal_node_pointer>(p_nd)->end();
+       ++it)
+    ret += recursive_count_leafs(*it);
+  return ret;
+}
+
+#endif 
+