1 // PR c++/53349 2 // { dg-do compile { target c++11 } } 3 4 template <int N> 5 struct Foo { FooFoo6 constexpr Foo(const Foo<N-1> a) : m_a(a) {} FooFoo7 constexpr Foo(const Foo<N> &a) : m_a(a.m_a) {} 8 9 Foo<N-1> m_a; 10 }; 11 12 template <> struct Foo<0> {}; 13 14 constexpr Foo<1> catty1(Foo<1> x) { return x; } 15 constexpr Foo<2> catty2(Foo<1> x) { return Foo<2>(catty1(x)); } 16 17 constexpr auto res = catty2(Foo<1>(Foo<0>())); 18