40 struct CopyableView : std::ranges::view_base {  struct
42   explicit CopyableView() noexcept(IsNoexcept) = default;  argument
43   CopyableView(CopyableView const&) noexcept(IsNoexcept) = default;
44   CopyableView& operator=(CopyableView const&) noexcept(IsNoexcept) = default;
45   constexpr explicit CopyableView(int start) noexcept : start_(start) {}  in CopyableView()  function
49 static_assert(std::ranges::view<CopyableView<true>>);  argument
50 static_assert(std::ranges::view<CopyableView<false>>);
104 …RT_SAME_TYPE(decltype(std::views::all(std::declval<const CopyableView<true>&>())), CopyableView<tr…  in test()
105     static_assert(noexcept(std::views::all(CopyableView<true>())));  in test()
106     static_assert(!noexcept(std::views::all(CopyableView<false>())));  in test()
108     CopyableView<true> view(2);  in test()
110     ASSERT_SAME_TYPE(decltype(viewCopy), CopyableView<true>);  in test()