[Bug libstdc++/105611] New: std::shift_left/right should not use ranges::next

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105611

            Bug ID: 105611
           Summary: std::shift_left/right should not use ranges::next
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

Because they are based on different iterator systems.

#include <algorithm>

struct I {
  std::in_place_t in_place;
  using value_type = int;
  using difference_type = std::ptrdiff_t;
  int& operator*() const;
  I& operator++();
  I operator++(int);
  bool operator==(I) const;
};

int main() {
  std::shift_left(I(), I(), 0);
  std::shift_right(I(), I(), 0);
}

https://godbolt.org/z/v35h5Eobe