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// PR c++/44909
// { dg-do compile { target c++11 } }
// Declaring A<D<E>>'s copy ctor means choosing a ctor to initialize D<E>,
// which means choosing a ctor for C<B<E>>, which meant considering
// C(const B<E>&) which means choosing a ctor for B<E>, which means choosing
// a ctor for A<D<E>>. Cycle.
template<typename T>
struct A
{
T t;
};
template <typename T>
struct B
{
typename T::U u;
};
template <typename T>
struct C
{
C(const T&);
};
template <typename T>
struct D
{
C<B<T> > v;
};
struct E {
typedef A<D<E> > U;
};
extern A<D<E> > a;
A<D<E> > a2(a);
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