1// RUN: %clang_cc1 -fsyntax-only -std=c++11 %s
2
3template <class T>
4T&&
5declval() noexcept;
6
7template <class T>
8struct some_trait
9{
10    static const bool value = false;
11};
12
13template <class T>
14void swap(T& x, T& y) noexcept(some_trait<T>::value)
15{
16    T tmp(static_cast<T&&>(x));
17    x = static_cast<T&&>(y);
18    y = static_cast<T&&>(tmp);
19}
20
21template <class T, unsigned N>
22struct array
23{
24    T data[N];
25
26    void swap(array& a) noexcept(noexcept(swap(declval<T&>(), declval<T&>())));
27};
28
29struct DefaultOnly
30{
31    DefaultOnly() = default;
32    DefaultOnly(const DefaultOnly&) = delete;
33    DefaultOnly& operator=(const DefaultOnly&) = delete;
34    ~DefaultOnly() = default;
35};
36
37int main()
38{
39    array<DefaultOnly, 1> a, b;
40}
41