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// { dg-do assemble  }

// GROUPS passed old-abort

//

// This one creates

//

// gcc2: Internal compiler error: program cc1plus got fatal signal 11

//

// when compiled with g++.

// The error goes away, if

// 1) int ClassInvariant() is not virtual or

// 2) GnObject has a virtual destructor or

// 3) GnWidget has no virtual destructor or

// 4) GnContracts has a virtual destructor

//

class GnContracts {

  public:

    virtual int ClassInvariant();

//    virtual ~GnContracts();

};

class GnObject : public GnContracts {

  public:

//    virtual ~GnObject();

};

class GnWidget : public GnObject {

  public:

    virtual ~GnWidget();

};

class GnOptionGroup : public GnObject, public GnWidget {// { dg-error "" }  warning

};