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1 // PR c++/94074 - wrong modifying const object error for COMPONENT_REF.
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2 // { dg-do compile { target c++14 } }
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3
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4 typedef decltype (sizeof (0)) size_t;
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5
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6 template <typename E, size_t N>
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7 struct array
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8 {
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9 constexpr const E &operator[](size_t n) const noexcept { return elems[n]; }
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10 E elems[N];
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11 };
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12
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13 template <typename E, size_t N>
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14 struct array2 {
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15 array<E, N> a;
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16 };
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17
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18 template <typename T>
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19 struct S {
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20 using U = array2<T, 4>;
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21 const U m;
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22 constexpr S(int) : m{}
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23 {
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24 const_cast<int &>(m.a[0]) = 42; // { dg-error "modifying a const object" }
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25 }
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26 };
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27
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28 constexpr S<int> p = { 10 }; // { dg-message "originally declared" }
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