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diff --git a/gcc/iterator-utils.h b/gcc/iterator-utils.h
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+// Iterator-related utilities.
+// Copyright (C) 2002-2020 Free Software Foundation, Inc.
+//
+// This file is part of GCC.
+//
+// GCC 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.
+//
+// GCC 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 GCC; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#ifndef GCC_ITERATOR_UTILS_H
+#define GCC_ITERATOR_UTILS_H 1
+
+// A half-open [begin, end) range of iterators.
+template<typename T>
+struct iterator_range
+{
+public:
+  using const_iterator = T;
+
+  iterator_range () = default;
+  iterator_range (const T &begin, const T &end)
+    : m_begin (begin), m_end (end) {}
+
+  T begin () const { return m_begin; }
+  T end () const { return m_end; }
+
+  explicit operator bool () const { return m_begin != m_end; }
+
+private:
+  T m_begin;
+  T m_end;
+};
+
+#endif