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diff --git a/third_party/msgpack/include/msgpack/v1/adaptor/ext.hpp b/third_party/msgpack/include/msgpack/v1/adaptor/ext.hpp
new file mode 100644
index 0000000000..de375975fb
--- /dev/null
+++ b/third_party/msgpack/include/msgpack/v1/adaptor/ext.hpp
@@ -0,0 +1,236 @@
+//
+// MessagePack for C++ static resolution routine
+//
+// Copyright (C) 2015-2016 KONDO Takatoshi
+//
+//    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 MSGPACK_V1_TYPE_EXT_HPP
+#define MSGPACK_V1_TYPE_EXT_HPP
+
+#include "msgpack/v1/adaptor/ext_decl.hpp"
+#include "msgpack/adaptor/check_container_size.hpp"
+#include <cstring>
+#include <string>
+#include <cassert>
+
+namespace msgpack {
+
+/// @cond
+MSGPACK_API_VERSION_NAMESPACE(v1) {
+/// @endcond
+
+namespace type {
+
+class ext {
+public:
+    ext() : m_data(1, 0) {}
+    ext(int8_t t, const char* p, uint32_t s) {
+        msgpack::detail::check_container_size_for_ext<sizeof(std::size_t)>(s);
+        m_data.reserve(static_cast<std::size_t>(s) + 1);
+        m_data.push_back(static_cast<char>(t));
+        m_data.insert(m_data.end(), p, p + s);
+    }
+    ext(int8_t t, uint32_t s) {
+        msgpack::detail::check_container_size_for_ext<sizeof(std::size_t)>(s);
+        m_data.resize(static_cast<std::size_t>(s) + 1);
+        m_data[0] = static_cast<char>(t);
+    }
+    ext(ext_ref const&);
+    int8_t type() const {
+        return static_cast<int8_t>(m_data[0]);
+    }
+    const char* data() const {
+        return &m_data[0] + 1;
+    }
+    char* data() {
+        return &m_data[0] + 1;
+    }
+    uint32_t size() const {
+        return static_cast<uint32_t>(m_data.size()) - 1;
+    }
+    bool operator== (const ext& x) const {
+        return m_data == x.m_data;
+    }
+
+    bool operator!= (const ext& x) const {
+        return !(*this == x);
+    }
+
+    bool operator< (const ext& x) const {
+        return m_data < x.m_data;
+    }
+
+    bool operator> (const ext& x) const {
+        return m_data > x.m_data;
+    }
+private:
+    std::vector<char> m_data;
+    friend class ext_ref;
+};
+
+} // namespace type
+
+namespace adaptor {
+
+template <>
+struct convert<msgpack::type::ext> {
+    msgpack::object const& operator()(msgpack::object const& o, msgpack::type::ext& v) const {
+        if(o.type != msgpack::type::EXT) {
+            throw msgpack::type_error();
+        }
+        v = msgpack::type::ext(o.via.ext.type(), o.via.ext.data(), o.via.ext.size);
+        return o;
+    }
+};
+
+template <>
+struct pack<msgpack::type::ext> {
+    template <typename Stream>
+    msgpack::packer<Stream>& operator()(msgpack::packer<Stream>& o, const msgpack::type::ext& v) const {
+        // size limit has already been checked at ext's constructor
+        uint32_t size = v.size();
+        o.pack_ext(size, v.type());
+        o.pack_ext_body(v.data(), size);
+        return o;
+    }
+};
+
+template <>
+struct object_with_zone<msgpack::type::ext> {
+    void operator()(msgpack::object::with_zone& o, const msgpack::type::ext& v) const {
+        // size limit has already been checked at ext's constructor
+        uint32_t size = v.size();
+        o.type = msgpack::type::EXT;
+        char* ptr = static_cast<char*>(o.zone.allocate_align(size + 1, MSGPACK_ZONE_ALIGNOF(char)));
+        o.via.ext.ptr = ptr;
+        o.via.ext.size = size;
+        ptr[0] = static_cast<char>(v.type());
+        std::memcpy(ptr + 1, v.data(), size);
+    }
+};
+
+} // namespace adaptor
+
+namespace type {
+
+class ext_ref {
+public:
+    // ext_ref should be default constructible to support 'convert'.
+    // A default constructed ext_ref object::m_ptr doesn't have the buffer to point to.
+    // In order to avoid nullptr checking branches, m_ptr points to m_size.
+    // So type() returns unspecified but valid value. It might be a zero because m_size
+    // is initialized as zero, but shouldn't assume that.
+    ext_ref() : m_ptr(static_cast<char*>(static_cast<void*>(&m_size))), m_size(0) {}
+    ext_ref(const char* p, uint32_t s) :
+        m_ptr(s == 0 ? static_cast<char*>(static_cast<void*>(&m_size)) : p),
+        m_size(s == 0 ? 0 : s - 1) {
+        msgpack::detail::check_container_size_for_ext<sizeof(std::size_t)>(s);
+    }
+
+    // size limit has already been checked at ext's constructor
+    ext_ref(ext const& x) : m_ptr(&x.m_data[0]), m_size(x.size()) {}
+
+    const char* data() const {
+        return m_ptr + 1;
+    }
+
+    uint32_t size() const {
+        return m_size;
+    }
+
+    int8_t type() const {
+        return static_cast<int8_t>(m_ptr[0]);
+    }
+
+    std::string str() const {
+        return std::string(m_ptr + 1, m_size);
+    }
+
+    bool operator== (const ext_ref& x) const {
+        return m_size == x.m_size && std::memcmp(m_ptr, x.m_ptr, m_size) == 0;
+    }
+
+    bool operator!= (const ext_ref& x) const {
+        return !(*this == x);
+    }
+
+    bool operator< (const ext_ref& x) const {
+        if (m_size < x.m_size) return true;
+        if (m_size > x.m_size) return false;
+        return std::memcmp(m_ptr, x.m_ptr, m_size) < 0;
+    }
+
+    bool operator> (const ext_ref& x) const {
+        if (m_size > x.m_size) return true;
+        if (m_size < x.m_size) return false;
+        return std::memcmp(m_ptr, x.m_ptr, m_size) > 0;
+    }
+private:
+    const char* m_ptr;
+    uint32_t m_size;
+    friend struct adaptor::object<msgpack::type::ext_ref>;
+};
+
+inline ext::ext(ext_ref const& x) {
+    // size limit has already been checked at ext_ref's constructor
+    m_data.reserve(x.size() + 1);
+
+    m_data.push_back(x.type());
+    m_data.insert(m_data.end(), x.data(), x.data() + x.size());
+}
+
+} // namespace type
+
+namespace adaptor {
+
+template <>
+struct convert<msgpack::type::ext_ref> {
+    msgpack::object const& operator()(msgpack::object const& o, msgpack::type::ext_ref& v) const {
+        if(o.type != msgpack::type::EXT) { throw msgpack::type_error(); }
+        v = msgpack::type::ext_ref(o.via.ext.ptr, o.via.ext.size + 1);
+        return o;
+    }
+};
+
+template <>
+struct pack<msgpack::type::ext_ref> {
+    template <typename Stream>
+    msgpack::packer<Stream>& operator()(msgpack::packer<Stream>& o, const msgpack::type::ext_ref& v) const {
+        // size limit has already been checked at ext_ref's constructor
+        uint32_t size = v.size();
+        o.pack_ext(size, v.type());
+        o.pack_ext_body(v.data(), size);
+        return o;
+    }
+};
+
+template <>
+struct object<msgpack::type::ext_ref> {
+    void operator()(msgpack::object& o, const msgpack::type::ext_ref& v) const {
+        // size limit has already been checked at ext_ref's constructor
+        uint32_t size = v.size();
+        o.type = msgpack::type::EXT;
+        o.via.ext.ptr = v.m_ptr;
+        o.via.ext.size = size;
+    }
+};
+
+template <>
+struct object_with_zone<msgpack::type::ext_ref> {
+    void operator()(msgpack::object::with_zone& o, const msgpack::type::ext_ref& v) const {
+        static_cast<msgpack::object&>(o) << v;
+    }
+};
+
+} // namespace adaptor
+
+/// @cond
+} // MSGPACK_API_VERSION_NAMESPACE(v1)
+/// @endcond
+
+} // namespace msgpack
+
+#endif // MSGPACK_V1_TYPE_EXT_HPP