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// PR c++/53349
// { dg-do compile { target c++11 } }
template <int N>
struct Foo {
constexpr Foo(const Foo<N-1> a) : m_a(a) {}
constexpr Foo(const Foo<N> &a) : m_a(a.m_a) {}
Foo<N-1> m_a;
};
template <> struct Foo<0> {};
constexpr Foo<1> catty1(Foo<1> x) { return x; }
constexpr Foo<2> catty2(Foo<1> x) { return Foo<2>(catty1(x)); }
constexpr auto res = catty2(Foo<1>(Foo<0>()));
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