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diff --git a/src/boost/libs/outcome/test/tests/default-construction.cpp b/src/boost/libs/outcome/test/tests/default-construction.cpp
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+/* Unit testing for outcomes
+(C) 2013-2019 Niall Douglas <http://www.nedproductions.biz/> (4 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.
+*/
+
+#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_default_construction, "Tests that outcome default constructs when it ought to")
+{
+  using namespace BOOST_OUTCOME_V2_NAMESPACE;
+  struct udt
+  {
+    int _v{78};
+    udt() = default;
+    constexpr explicit udt(int v) noexcept : _v(v) {}
+    udt(udt &&o) = delete;
+    udt(const udt &) = delete;
+    udt &operator=(udt &&o) = delete;
+    udt &operator=(const udt &) = delete;
+    ~udt() = default;
+    constexpr int operator*() const noexcept { return _v; }
+  };
+  // One path is via success_type<void>
+  outcome<udt> a(success());
+  BOOST_CHECK(*a.value() == 78);
+
+  // Other path is via explicit conversion from void
+  outcome<void> c = success();
+  outcome<udt> d(c);
+  BOOST_CHECK(*d.value() == 78);
+}