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These deduction guides became useless with LWG 3282 (implemented in commit r10-6741) and so were removed by LWG 3404. libstdc++-v3/ChangeLog: PR libstdc++/100044 * include/bits/ranges_util.h (__detail::__iterator_sentinel_pair): Remove helper concept. (subrange(_Pr), subrange(Pr, __make_unsigned_like<...>)): Remove deduction guides, as per LWG 3404. * testsuite/std/ranges/subrange/lwg3282_neg.cc: Check that class template argument deduction fails.
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.