Hi all,   
      
   I bumped into a compilation error with GCC 4.8 with the following code:   
      
   $ cat t.cc   
   class B   
   {   
   protected:   
     struct S {};   
     virtual void doIt(struct S& s) = 0;   
   };   
      
   class D : public B   
   {   
   public:   
     using B::S;   
     virtual void doIt(struct S& s);   
   };   
      
   void D::doIt(struct S& s)   
   {   
     (void)s;   
   }   
      
   $ g++ -Wall -Wextra -Woverloaded-virtual -c t.cc   
   t.cc:5:16: warning: 'virtual void B::doIt(B::S&)' was hidden   
   [-Woverloaded-virtual]   
      virtual void doIt(struct S& s) = 0;   
                   ^   
   t.cc:12:16: warning:   by 'virtual void D::doIt(S&)' [-Woverloaded-virtual]   
      virtual void doIt(struct S& s);   
                   ^   
   t.cc:15:6: error: prototype for 'void D::doIt(B::S&)' does not match any in   
   class 'D'   
    void D::doIt(struct S& s)   
         ^   
   t.cc:12:16: error: candidate is: virtual void D::doIt(S&)   
      virtual void doIt(struct S& s);   
                   ^   
      
   When I remove struct in the declaration of doIt(), everything compiles fine.   
   What's going on here?   
      
      
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