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diff --git a/src/boost/libs/outcome/test/tests/comparison.cpp b/src/boost/libs/outcome/test/tests/comparison.cpp
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+++ b/src/boost/libs/outcome/test/tests/comparison.cpp
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+/* Unit testing for outcomes
+(C) 2013-2020 Niall Douglas <http://www.nedproductions.biz/> (6 commits)
+
+
+Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+*/
+
+#ifdef _MSC_VER
+#pragma warning(disable : 4127)  // conditional expression is constant
+#pragma warning(disable : 4244)  // conversion from int to short
+#endif
+
+#include <boost/outcome/outcome.hpp>
+#include <boost/test/unit_test.hpp>
+#include <boost/test/unit_test_monitor.hpp>
+
+BOOST_OUTCOME_AUTO_TEST_CASE(works_outcome_comparison, "Tests that the outcome can compare to compatible outcomes")
+{
+#if !defined(__APPLE__) || defined(__cpp_exceptions)
+  using namespace BOOST_OUTCOME_V2_NAMESPACE;
+  auto p = boost::copy_exception(std::runtime_error("hi"));
+  // value comparison
+  {
+    outcome<int> a(1), b(2), c(2);
+    BOOST_CHECK(a == a);
+    BOOST_CHECK(b == b);
+    BOOST_CHECK(c == c);
+    BOOST_CHECK(a != b);
+    BOOST_CHECK(b == c);
+  }
+  // homogeneous outcome comparison
+  {
+    outcome<int> a(1), b(2), c(boost::system::errc::invalid_argument), d(p);
+    BOOST_CHECK(a == a);
+    BOOST_CHECK(a != b);
+    BOOST_CHECK(a != c);
+    BOOST_CHECK(a != d);
+    BOOST_CHECK(b == b);
+    BOOST_CHECK(b != c);
+    BOOST_CHECK(b != d);
+    BOOST_CHECK(c == c);
+    BOOST_CHECK(c != d);
+    BOOST_CHECK(d == d);
+    outcome<int> e(boost::system::errc::invalid_argument), f(p);
+    BOOST_CHECK(c == e);
+    BOOST_CHECK(d == f);
+  }
+  // heterogeneous outcome comparison, so outcome<int> to outcome<double> etc
+  {
+    outcome<int> a(1);
+    outcome<double> b(1);
+    outcome<unsigned short> c(1);
+    BOOST_CHECK(a == b);
+    BOOST_CHECK(a == c);
+    BOOST_CHECK(b == a);
+    BOOST_CHECK(b == c);
+    BOOST_CHECK(c == a);
+    BOOST_CHECK(c == b);
+    // outcome<void> e(in_place_type<void>);
+    outcome<unsigned short> f(boost::system::errc::invalid_argument);
+    outcome<double> g(p);
+    // BOOST_CHECK(a != e);
+    BOOST_CHECK(a != f);
+    BOOST_CHECK(a != g);
+    // BOOST_CHECK(e != f);
+    BOOST_CHECK(f != g);
+  }
+  // upconverting outcome comparison, so outcome<int>==result<int> etc
+  {
+    outcome<int> a(1);
+    result<int> b(1);
+    BOOST_CHECK(a == b);
+    BOOST_CHECK(b == a);
+    // result<void> e(in_place_type<void>), f(boost::system::errc::invalid_argument);
+    // BOOST_CHECK(a != e);
+    // BOOST_CHECK(a != f);
+  }
+  // Should I do outcome<int>(5) == 5? Unsure if it's wise
+#endif
+}