Add a test for the fs::copy issue in PR #70/#71

test/Jamfile.v2

@@ -42,4 +42,7 @@ path-constant HERE : . ;
 
        # `quick` target (for CI)
        [ run quick.cpp ]
+
+       # Tests for specific issues
+       [ run issues/70-71-copy.cpp ]
        ;

test/issues/70-71-copy.cpp

@@ -0,0 +1,20 @@
+
+// Copyright 2018 Peter Dimov.
+//
+// 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
+
+// See library home page at http://www.boost.org/libs/filesystem
+
+#include <boost/filesystem.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+namespace fs = boost::filesystem;
+
+int main()
+{
+    BOOST_TEST_THROWS( fs::copy( "/tmp/non-existent-a", "/tmp/non-existent-b" ), std::exception );
+    return boost::report_errors();
+}