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diff --git a/src/boost/libs/fiber/examples/asio/yield.hpp b/src/boost/libs/fiber/examples/asio/yield.hpp
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+//          Copyright 2003-2013 Christopher M. Kohlhoff
+//          Copyright Oliver Kowalke, Nat Goodspeed 2015.
+// 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)
+
+
+#ifndef BOOST_FIBERS_ASIO_YIELD_HPP
+#define BOOST_FIBERS_ASIO_YIELD_HPP
+
+#include <boost/config.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace fibers {
+namespace asio {
+
+//[fibers_asio_yield_t
+class yield_t {
+public:
+    yield_t() = default;
+
+    /**
+     * @code
+     * static yield_t yield;
+     * boost::system::error_code myec;
+     * func(yield[myec]);
+     * @endcode
+     * @c yield[myec] returns an instance of @c yield_t whose @c ec_ points
+     * to @c myec. The expression @c yield[myec] "binds" @c myec to that
+     * (anonymous) @c yield_t instance, instructing @c func() to store any
+     * @c error_code it might produce into @c myec rather than throwing @c
+     * boost::system::system_error.
+     */
+    yield_t operator[]( boost::system::error_code & ec) const {
+        yield_t tmp;
+        tmp.ec_ = & ec;
+        return tmp;
+    }
+
+//private:
+    // ptr to bound error_code instance if any
+    boost::system::error_code   *   ec_{ nullptr };
+};
+//]
+
+//[fibers_asio_yield
+// canonical instance
+thread_local yield_t yield{};
+//]
+
+}}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_SUFFIX
+#endif
+
+#include "detail/yield.hpp"
+
+#endif // BOOST_FIBERS_ASIO_YIELD_HPP