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diff --git a/boost/spirit/home/x3/directive/expect.hpp b/boost/spirit/home/x3/directive/expect.hpp
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+++ b/boost/spirit/home/x3/directive/expect.hpp
@@ -0,0 +1,80 @@
+/*=============================================================================
+    Copyright (c) 2001-2014 Joel de Guzman
+
+    Distributed under the Boost Software License, Version 1.0. (See accompanying
+    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+=============================================================================*/
+#if !defined(SPIRIT_EXPECT_MARCH_16_2012_1024PM)
+#define SPIRIT_EXPECT_MARCH_16_2012_1024PM
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/spirit/home/x3/support/context.hpp>
+#include <boost/spirit/home/x3/core/parser.hpp>
+#include <boost/throw_exception.hpp>
+#include <stdexcept>
+
+namespace boost { namespace spirit { namespace x3
+{
+    template <typename Iterator>
+    struct expectation_failure : std::runtime_error
+    {
+    public:
+
+        expectation_failure(Iterator where, std::string const& which)
+          : std::runtime_error("boost::spirit::x3::expectation_failure")
+          , where_(where), which_(which)
+        {}
+        ~expectation_failure() throw() {}
+        
+        std::string which() const { return which_; }
+        Iterator const& where() const { return where_; }
+        
+    private:
+
+        Iterator where_;
+        std::string which_;
+    };
+
+    template <typename Subject>
+    struct expect_directive : unary_parser<Subject, expect_directive<Subject>>
+    {
+        typedef unary_parser<Subject, expect_directive<Subject> > base_type;
+        static bool const is_pass_through_unary = true;
+
+        expect_directive(Subject const& subject)
+          : base_type(subject) {}
+
+        template <typename Iterator, typename Context
+          , typename RContext, typename Attribute>
+        bool parse(Iterator& first, Iterator const& last
+          , Context const& context, RContext& rcontext, Attribute& attr) const
+        {
+            bool r = this->subject.parse(first, last, context, rcontext, attr);
+
+            if (!r)
+            {
+                boost::throw_exception(
+                    expectation_failure<Iterator>(
+                        first, what(this->subject)));
+            }
+            return r;
+        }
+    };
+
+    struct expect_gen
+    {
+        template <typename Subject>
+        expect_directive<typename extension::as_parser<Subject>::value_type>
+        operator[](Subject const& subject) const
+        {
+            return {as_parser(subject)};
+        }
+    };
+
+    expect_gen const expect = expect_gen();
+}}}
+
+#endif