Crash in integer_sort when reverse sorting a struct

[Domagoj Šarić]

I have a custom 'zip' iterator (that iterates over two arrays):

• its value_type = std::pair<std::uint32_t, T>
• its reference = std::pair<std::uint32_t &, T &>.

I want to reverse sort these two arrays so I do:

auto const comparator( []( auto const & left, auto const & right ) noexcept { return left.first > right.first; } );
auto const rightshift{ []( custom_iterator::reference const x, unsigned const offset ) noexcept { return x.first >> offset; } };

...but there is a crash in integer_sort in this case (if I do a 'normal' less-than compare, i.e. not a reversed sort) then it works...