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// { dg-do compile }
// Origin:

// PR c++/6716
// ICE in complex class structure when components are incomplete

template <class T> struct X {
  T t;                          // { dg-error "incomplete" }
};

template <class T> struct Y {
  X<T> x;                       // { dg-error "instantiated" }
};

template <class T> struct Z {   // { dg-error "declaration" }
  Y<Z<T> > y;                   // { dg-error "instantiated" }
};

struct ZZ : Z<int>              // { dg-error "instantiated" }
{
};