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diff --git a/src/third_party/boost-1.69.0/boost/coroutine/detail/coroutine_context.hpp b/src/third_party/boost-1.69.0/boost/coroutine/detail/coroutine_context.hpp
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+++ b/src/third_party/boost-1.69.0/boost/coroutine/detail/coroutine_context.hpp
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+
+//          Copyright Oliver Kowalke 2009.
+// 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_COROUTINES_DETAIL_COROUTINE_CONTEXT_H
+#define BOOST_COROUTINES_DETAIL_COROUTINE_CONTEXT_H
+
+#include <cstddef>
+
+#include <boost/assert.hpp>
+#include <boost/config.hpp>
+#include <boost/context/detail/fcontext.hpp>
+
+#include <boost/coroutine/detail/config.hpp>
+#include <boost/coroutine/detail/preallocated.hpp>
+#include <boost/coroutine/stack_context.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace coroutines {
+namespace detail {
+
+// class hold stack-context and coroutines execution-context
+class BOOST_COROUTINES_DECL coroutine_context
+{
+private:
+    template< typename Coro >
+    friend void trampoline( context::detail::transfer_t);
+    template< typename Coro >
+    friend void trampoline_void( context::detail::transfer_t);
+    template< typename Coro >
+    friend void trampoline_pull( context::detail::transfer_t);
+    template< typename Coro >
+    friend void trampoline_push( context::detail::transfer_t);
+    template< typename Coro >
+    friend void trampoline_push_void( context::detail::transfer_t);
+
+    preallocated            palloc_;
+    context::detail::fcontext_t     ctx_;
+
+public:
+    typedef void( * ctx_fn)( context::detail::transfer_t);
+
+    // default ctor represents the current execution-context
+    coroutine_context();
+
+    // ctor creates a new execution-context running coroutine-fn `fn`
+    // `ctx_` will be allocated on top of the stack managed by parameter
+    // `stack_ctx`
+    coroutine_context( ctx_fn fn, preallocated const& palloc);
+
+    coroutine_context( coroutine_context const&);
+
+    coroutine_context& operator=( coroutine_context const&);
+
+    void * jump( coroutine_context &, void * = 0);
+
+    stack_context & stack_ctx()
+    { return palloc_.sctx; }
+};
+
+}}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_COROUTINES_DETAIL_COROUTINE_CONTEXT_H