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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/103563] ostream operator<< resolved to variant containing
 type resulting in stack overflow
Date: Sun, 05 Dec 2021 11:17:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103563

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The following code is same example but removed the headers and such:
namespace t
{
   class g{}cout;
   template<class ...T>
   struct v
   {
     template <class T1> v(T1&&){}
   };
  class monostate {};
  g &operator <<(g &out, const char *a);
}
struct V
{
    int a;
};
inline t::g& operator << (t::g& os, const t::v<t::monostate, V>& a)
{
    V v;
    os << v;
    return os;
}

int main()
{
    V v=3D{4};
    t::cout << v;
    return 0;
}=