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PR libstdc++/72745 * include/std/array (get): Use positive message for static assertions. * include/std/functional (_Safe_tuple_element_t): Fix indentation. * include/std/tuple (tuple_element<I, tuple<>>): Add partial specialization for invalid indices, with static assertion. * testsuite/20_util/tuple/element_access/get_neg.cc: New test. This improves the diagnostic for std::get<1>( tuple<int>{} ) by adding a static assertion that the index is in range. Tested powerpc64-linux, committed to trunk.
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