Here's how it looks when you write readable C++:

    for (const auto &[x, y]: zip(a, subrange(begin(b), unreachable_sentinel))) {
        /* Do something with x and y */
    }

I'm not sure why C++ programmers don't like using `using`, it's as if Java programmers insist on typing out java.util.ArrayList every time because you may have an ArrayList of your own in the future.

So much C++ code can become readable by adding `using namespace std::something`.