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1 // RUN: %clang_cc1 -std=c++1z -verify %s
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2
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3 struct A { int x, y; };
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4 typedef int B[2];
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5 struct C { template<int> int get(); };
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6 struct D { int x, y, z; };
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7 struct E { int *p, n; };
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8
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9 namespace std {
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10 using size_t = decltype(sizeof(0));
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11 template<typename> struct tuple_size;
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12 template<size_t, typename> struct tuple_element { using type = int; };
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13 }
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14
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15 template<> struct std::tuple_size<C> { enum { value = 2 }; };
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16
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17 template<typename T> int decomp(T &t) {
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18 auto &[a, b] = t; // expected-error {{type 'D' decomposes into 3 elements, but only 2 names were provided}}
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19 return a + b; // expected-error {{cannot initialize return object of type 'int' with an rvalue of type 'int *'}}
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20 }
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21
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22 void test() {
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23 A a;
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24 B b;
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25 C c;
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26 D d;
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27 E e;
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28 decomp(a);
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29 decomp(b);
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30 decomp(c);
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31 decomp(d); // expected-note {{in instantiation of}}
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32 decomp(e); // expected-note {{in instantiation of}}
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33 }
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