1 // PR c++/52685 2 3 template <typename T> 4 struct A 5 { 6 template <typename U> 7 struct B : public A <B<U> > // { dg-message "not complete" } 8 { 9 struct C : public B<U> // { dg-error "incomplete" } 10 { 11 }; 12 }; 13 }; 14