#define A W(aaaaaaaaaaaaaa)
#define W(b) X(b##b##b##b##b##b##b)
#define X(b) Y(b##b##b##b##b##b##b)
#define Y(b) Z(b##b##b##b##b##b##b)
#define Z(b) b##b##b##b##b##b##b##b
template<class T,class...>class A{A<T,T,T,T,T,T,A>a;};A<A<A<A<A<A<A<float>>>>>>>c;
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