class InterfaceA
{
public:
    class InnerClass         {};
};

class ImplementationA : public InterfaceA
{
public:
    struct SomeInnerStructure
    {
        InnerClass*                 p1;
        ~~~~~~~~~~~ <-- spelling checker marks here, but this is legitimate
   
        InterfaceA::InnerClass*     p2;      <-- spelling checker don't complain.
    };
};