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+It is easier to delete unwanted defaults than implementing dummies.
+<code>
+  class C{
+    // explicit C(){ unreachable(); } // note: may be ill formed.
+    explicit C() = delete;
+    [..]
+  };
+</code>
+The use of "delete" will produce errors at compile time, much like correcly placed dummies. It's nice to have a real language feature here, to not need to resort to dummies.
+NB: There is still a hole.  If you don't either delete or make a dummy, you can still get caught.