You can now manually disable move semantics.

This may be useful in MSVC to work around a bug described in Trac #10399

test/Jamfile.v2

@@ -33,6 +33,7 @@ import testing ;
     [ run optional_test_value_access.cpp ]
     [ run optional_test_emplace.cpp ]
     [ run optional_test_minimum_requirements.cpp ]
+    [ run optional_test_msvc_bug_workaround.cpp ]
     [ compile-fail optional_test_fail1.cpp ]
     [ compile-fail optional_test_fail3a.cpp ]
     [ compile-fail optional_test_fail3b.cpp ]