On 24/02/20 18:26 -0500, Patrick Palka wrote:
libstdc++-v3/ChangeLog:LWG 3313 join_view::_Iterator::operator-- is incorrectly constrained * include/std/ranges (join_view::_Iterator::operator--): Require that range_reference_t<_Base> models common_range. * testsuite/std/ranges/adaptors/lwg3313_neg.cc: New test.
OK.