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struct X { constexpr X() : n(5) { n *= 2; } int n; }; constexpr int g(const int (&is)[4]) { X x; int r = x.n; for (int i = 0; i < 5; ++i) r += i; for (auto& i : is) r += i; return r; } int someFunc() { constexpr int k3 = g({ 4, 5, 6, 7 }); return k3 - 42; }