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All std::span member functions are pure functions that have no side effects. They are only useful for their return value, so they should all warn if that value is not used. libstdc++-v3/ChangeLog: * include/std/span (span, as_bytes, as_writable_bytes): Add [[nodiscard]] attribute on all non-void functions. * testsuite/23_containers/span/back_assert_neg.cc: Suppress nodiscard warning. * testsuite/23_containers/span/back_neg.cc: Likewise. * testsuite/23_containers/span/first_2_assert_neg.cc: Likewise. * testsuite/23_containers/span/first_assert_neg.cc: Likewise. * testsuite/23_containers/span/first_neg.cc: Likewise. * testsuite/23_containers/span/front_assert_neg.cc: Likewise. * testsuite/23_containers/span/front_neg.cc: Likewise. * testsuite/23_containers/span/index_op_assert_neg.cc: Likewise. * testsuite/23_containers/span/index_op_neg.cc: Likewise. * testsuite/23_containers/span/last_2_assert_neg.cc: Likewise. * testsuite/23_containers/span/last_assert_neg.cc: Likewise. * testsuite/23_containers/span/last_neg.cc: Likewise. * testsuite/23_containers/span/subspan_2_assert_neg.cc: Likewise. * testsuite/23_containers/span/subspan_3_assert_neg.cc: Likewise. * testsuite/23_containers/span/subspan_4_assert_neg.cc: Likewise. * testsuite/23_containers/span/subspan_5_assert_neg.cc: Likewise. * testsuite/23_containers/span/subspan_6_assert_neg.cc: Likewise. * testsuite/23_containers/span/subspan_assert_neg.cc: Likewise. * testsuite/23_containers/span/subspan_neg.cc: Likewise. * testsuite/23_containers/span/nodiscard.cc: New test.