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This implements the proposed resolution of LWG 3433, which fixes subrange::advance when called with a negative argument. libstdc++-v3/ChangeLog: LWG 3433 subrange::advance(n) has UB when n < 0 * include/std/ranges (subrange::prev): Fix typo. (subrange::advance): Handle a negative argument as per the proposed resolution of LWG 3433. * testsuite/std/ranges/subrange/lwg3433.cc: New test.
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