new file mode 100644
--- /dev/null
+++ b/libinterp/parse-tree/pt-array-list.cc
@@ -0,0 +1,108 @@
+/*
+
+Copyright (C) 2013 John W. Eaton
+
+This file is part of Octave.
+
+Octave 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 of the License, or (at your
+option) any later version.
+
+Octave 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 Octave; see the file COPYING.  If not, see
+<http://www.gnu.org/licenses/>.
+
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <iostream>
+
+#include "error.h"
+#include "pt-array-list.h"
+
+tree_array_list::~tree_array_list (void)
+{
+  while (! empty ())
+    {
+      iterator p = begin ();
+      delete *p;
+      erase (p);
+    }
+}
+
+bool
+tree_array_list::all_elements_are_constant (void) const
+{
+  for (const_iterator p = begin (); p != end (); p++)
+    {
+      octave_quit ();
+
+      tree_argument_list *elt = *p;
+
+      if (! elt->all_elements_are_constant ())
+        return false;
+    }
+
+  return true;
+}
+
+bool
+tree_array_list::has_magic_end (void) const
+{
+  for (const_iterator p = begin (); p != end (); p++)
+    {
+      octave_quit ();
+
+      tree_argument_list *elt = *p;
+
+      if (elt && elt->has_magic_end ())
+        return true;
+    }
+
+  return false;
+}
+
+void
+tree_array_list::copy_base (const tree_array_list& array_list)
+{
+  tree_expression::copy_base (array_list);
+}
+
+void
+tree_array_list::copy_base (const tree_array_list& array_list,
+                            symbol_table::scope_id scope,
+                            symbol_table::context_id context)
+{
+  for (const_iterator p = array_list.begin (); p != array_list.end (); p++)
+    {
+      const tree_argument_list *elt = *p;
+
+      append (elt ? elt->dup (scope, context) : 0);
+    }
+
+  copy_base (*this);
+}
+
+tree_expression *
+tree_array_list::dup (symbol_table::scope_id scope,
+                      symbol_table::context_id context) const
+{
+  panic_impossible ();
+  return 0;
+}
+
+void
+tree_array_list::accept (tree_walker&)
+{
+  panic_impossible ();
+}
+