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     Compiler error C2254
 
     'function' : pure specifier not allowed on friend functions
 
     The specified friend function was specified as pure virtual.
 
     The following is an example of this error:
 
          class A
          {
          public:
             friend void func1() = 0;   // error, func1 is friend
             void virtual func2() = 0;  // OK, pure virtual
             friend void func3();       // OK, friend not virtual nor
          };                            //     pure
 
          void func1() {};
          void func3() {};
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