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// Build don't link:
// 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 {
};// ERROR - warning
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