// { dg-do compile }// Origin:// PR c++/6716// ICE in complex class structure when components are incompletetemplate <class T> struct X {  T t;				// { dg-error "incomplete" }};template <class T> struct Y {	// { dg-error "instantiated" }  X<T> x;};template <class T> struct Z {	// { dg-error "instantiated|declaration" }  Y<Z<T> > y;};struct ZZ : Z<int>{				// { dg-error "instantiated" }};