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      1 class PureVirtualBase {
      2  public:
      3   virtual ~PureVirtualBase() = 0;
      4   virtual void foo_pure() = 0;
      5   virtual void foo_virtual() {}
      6 };
      7 
      8 class DerivedBar : public PureVirtualBase {
      9  public:
     10   virtual ~DerivedBar() {}
     11   virtual void foo_pure() override {}
     12   virtual void foo_virtual() override = 0;
     13 };
     14 
     15 PureVirtualBase::~PureVirtualBase() {}
     16