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// RUN: %clang_cc1 -fsyntax-only -std=c++11 %s
template <class T>
T&&
declval() noexcept;
template <class T>
struct some_trait
{
static const bool value = false;
};
template <class T>
void swap(T& x, T& y) noexcept(some_trait<T>::value)
{
T tmp(static_cast<T&&>(x));
x = static_cast<T&&>(y);
y = static_cast<T&&>(tmp);
}
template <class T, unsigned N>
struct array
{
T data[N];
void swap(array& a) noexcept(noexcept(::swap(declval<T&>(), declval<T&>())));
};
struct DefaultOnly
{
DefaultOnly() = default;
DefaultOnly(const DefaultOnly&) = delete;
DefaultOnly& operator=(const DefaultOnly&) = delete;
~DefaultOnly() = default;
};
int main()
{
array<DefaultOnly, 1> a, b;
}
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