| 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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| 34 | |
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