private final class destructors

[bearophile]

According to TDPL the whole object destructor chain is called up to the top of 
the hyerarchy.
This D2 program compiles and runs with DMD 2.048 with no errors:


import std.c.stdio: puts;
class Base {
     private final ~this() { puts("Base.~this"); }
}
class Derived : Base {
    private final ~this() { puts("Derived.~this"); }
}
void main() {
    new Derived();
}


Output:

Derived.~this
Base.~this


Are the 'private final' attributes used here correct?
See also:  http://d.puremagic.com/issues/show_bug.cgi?id=3934

Bye,
bearophile