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Jonathan Wakely (Red Hat) authored
Implement the changes from P2162R2 (as a DR for C++17). libstdc++-v3/ChangeLog: PR libstdc++/90943 * include/std/variant (__cpp_lib_variant): Update value. (__detail::__variant::__as): New helpers implementing the as-variant exposition-only function templates. (visit, visit<R>): Use __as to upcast the variant parameters. * include/std/version (__cpp_lib_variant): Update value. * testsuite/20_util/variant/visit_inherited.cc: New test.
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