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1 // PR c++/77830
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2 // { dg-do compile { target c++14 } }
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3
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4 template <int N>
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5 struct P
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6 {
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7 char arr[N][1];
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8 constexpr void foo (const char *, int);
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9 };
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10
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11 template <int N>
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12 constexpr void
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13 P<N>::foo (const char *, int i)
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14 {
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15 for (auto j = 0; j < 2; ++j)
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16 arr[i][j] = true;
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17 }
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18
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19 template <typename... T>
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20 constexpr auto
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21 bar (T... a)
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22 {
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23 const char *s[]{a...};
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24 P<sizeof...(a)> p{};
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25 for (auto i = 0; i < sizeof...(a); ++i)
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26 p.foo (s[i], i); // { dg-message "in .constexpr. expansion of " }
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27 return p;
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28 }
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29
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30 int
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31 main ()
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32 {
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33 constexpr auto a = bar ("", ""); // { dg-error "outside the bounds of array type|in .constexpr. expansion of " }
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34 }
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