Hacking happily along at the POV-Ray code, I stumbled across this MS 
Visual Studio 2005 C++ anomaly:

   class A
   {
       protected:
           void a() {}
   };

   class B : public A
   {
       protected:
           void b(A* other)
           {
               this->a();  // (1)
               other->a(); // (2)
           }
   };

While (1) compiles fine, (2) raises an error C2248, "'A::a' : cannot 
access protected member declared in class 'A'"

What the F*** am I doing wrong here?

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