[Bug libstdc++/103992] New: common_iterator(const common_iterator<_It2, _Sent2>& __x) uses new instead of construct_at

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103992

            Bug ID: 103992
           Summary: common_iterator(const common_iterator<_It2, _Sent2>&
                    __x) uses new instead of construct_at
           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: ---

common_iterator(const common_iterator<_It2, _Sent2>& __x) and
common_iterator(const common_iterator& __x) still use new.

#include<iterator>

template<class T>
using CI = std::common_iterator<
  std::reverse_iterator<T>, 
  std::unreachable_sentinel_t>;

static_assert([] {
  CI<const int*> it1 = CI<int*>{};
  return true;
}());

https://godbolt.org/z/aT431jrhd