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// PR c++/44909

// { dg-options -std=c++0x }

// Declaring A>'s copy ctor means choosing a ctor to initialize D,

// which means choosing a ctor for C>, which meant considering

// C(const B&) which means choosing a ctor for B, which means choosing

// a ctor for A>.  Cycle.

template

struct A

{

  T t;

};

template 

struct B

{

  typename T::U u;

};

template 

struct C

{

  C(const T&);

};

template 

struct D

{

  C > v;

};

struct E {

  typedef A > U;

};

extern A > a;

A > a2(a);