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* include/std/type_traits (__do_common_type_impl): Implement additional COND-RES(CREF(D1), CRED(D2)) condition for C++20. (basic_common_reference, common_reference, common_reference_t): Define for C++20. * testsuite/20_util/common_reference/requirements/alias_decl.cc: New test. * testsuite/20_util/common_reference/requirements/ explicit_instantiation.cc: New test. * testsuite/20_util/common_reference/requirements/typedefs.cc: New test. From-SVN: r275594
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.