shinichiro.h posted this on D.gnu.  With the changes in 0.106, it also affects DMD.

Module A:
  module a;
  class A { this() { } }
  class B : A { private: }


Module B:
  import a;
  void x() { new B; }

Compiling module B yields:

b.d:2: class a.B member this is not accessible


David