This code is valid, but rejected by GCC:

struct A { void f(); }; 
typedef void F(); 
struct B { friend F A::f; };

// error: type 'A' is not derived from type 'B'


-- 
           Summary: GCC does not accept friend function declarations using a
                    typedef for function type.
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: schaub-johannes at web dot de
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44402

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