Consider the following example:

    struct A {
       A();
       ~A() = delete;
    };

    struct B: A { };
    B* b = new B;

Under the current rules, B() is not deleted, but is ill-formed because it calls the deleted ~A::A() if it exits via an exception after the completion of the construction of A. A deleted subobject destructor should be added to the list of reasons for implicit deletion in 11.4.5 [class.ctor] and 11.4.5.3 [class.copy.ctor].