diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 00bfd49..58ede82 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -154,7 +154,10 @@ boost_test(TYPE run SOURCES result_eq.cpp)
 boost_test(TYPE run SOURCES result_range_for.cpp)
 boost_test(TYPE run SOURCES result_value_construct2.cpp)
 boost_test(TYPE run SOURCES result_error_construct2.cpp)
+boost_test(TYPE run SOURCES result_errc_construct.cpp)
 boost_test(TYPE run SOURCES result_convert_construct.cpp)
 boost_test(TYPE run SOURCES result_typedefs.cpp)
 boost_test(TYPE run SOURCES result_value_construct3.cpp)
 boost_test(TYPE run SOURCES result_error_construct3.cpp)
+boost_test(TYPE run SOURCES result_emplace.cpp)
+boost_test(TYPE run SOURCES result_error_construct4.cpp)
diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index 0ca52cb..4da60c4 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -190,3 +190,4 @@ run result_typedefs.cpp : : : $(CPP11) ;
 run result_value_construct3.cpp : : : $(CPP11) ;
 run result_error_construct3.cpp : : : $(CPP11) ;
 run result_emplace.cpp : : : $(CPP11) ;
+run result_error_construct4.cpp : : : $(CPP11) ;
diff --git a/test/result_error_construct4.cpp b/test/result_error_construct4.cpp
new file mode 100644
index 0000000..d596813
--- /dev/null
+++ b/test/result_error_construct4.cpp
@@ -0,0 +1,49 @@
+// Copyright 2023 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/system/result.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+using namespace boost::system;
+
+// Eigen::Matrix4d has an explicit templated constructor
+// https://github.com/boostorg/system/issues/103
+// https://github.com/boostorg/json/issues/843
+
+struct X
+{
+    X() {}
+    template<class T> explicit X( T const& ) {}
+};
+
+int main()
+{
+    {
+        auto ec = make_error_code( errc::invalid_argument );
+
+        result<X> r = ec;
+
+        BOOST_TEST( !r.has_value() );
+        BOOST_TEST( r.has_error() );
+
+        BOOST_TEST_EQ( r.error(), ec );
+    }
+
+#if defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR)
+
+    {
+        auto ec = make_error_code( std::errc::invalid_argument );
+
+        result<X> r = ec;
+
+        BOOST_TEST( !r.has_value() );
+        BOOST_TEST( r.has_error() );
+
+        BOOST_TEST_EQ( r.error(), ec );
+    }
+
+#endif
+
+    return boost::report_errors();
+}