Class NoDefaultCtor

tests/test_stl.cpp:206–209

    m.def("load_array", [](const std::array<int, 2> &a) { return a[0] == 1 && a[1] == 2; });

    struct NoDefaultCtor {
        explicit constexpr NoDefaultCtor(int val) : val{val} {}
        int val;
    };

    struct NoDefaultCtorArray {
        explicit constexpr NoDefaultCtorArray(int i)