https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106013

            Bug ID: 106013
           Summary: weakly_incrementable cannot apply on common_iterator
           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: ---

At the moment I don't know why this is recursive, I'll try to reduce it when I
have time. So let me assume this is a libstdc++ bug and not a language bug.

#include <iterator>

struct I {
  using difference_type = int;
  int operator*() const;
  I& operator++();
  I operator++(int);
};

using CI = std::common_iterator<I, std::unreachable_sentinel_t>;
static_assert(std::weakly_incrementable<CI>);

https://godbolt.org/z/661djbrPs

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