I have simple istream_view and then I am trying to use ranges::copy on result.
auto t = ranges::istream_view<int>(is);
ranges::copy(t, std::back_inserter(v));
GCC does everything ok, clang fails with error:
error: no matching function for call to object of type 'const std::ranges::__copy_fn'
ranges::copy(t, std::back_inserter(v));
Probably it is because istream_view is moveonly view.
How to argue in this case who is right?
Standard C++20 [range.istream.overview] have similar example:
auto ints = istringstream{"0 1 2 3 4"};
ranges::copy(ranges::istream_view<int>(ints), ostream_iterator<int>{cout, "-"});
Which also fails in clang (and this is definitely a bug but I am not sure that reason is the same for both compile-time errors).
