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Clang now defines an __is_unsigned built-in, and Windows defines an _Out_ macro. Replace uses of those as identifiers. There might also be a problem with __is_signed, which we use in several places. libstdc++-v3/ChangeLog: * include/std/chrono (hh_mm_ss): Rename __is_unsigned member to _S_is_unsigned. * include/std/format (basic_format_context): Rename _Out_ template parameter to _Out2. * testsuite/17_intro/names.cc: Add Windows SAL annotation macros.
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