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GCC assumes that any global variable might be modified by operator new, and so in the testcase for this PR all data members get reloaded after allocating new storage. By making local copies of the _M_start and _M_finish members we avoid that, and then the compiler has enough info to remove the dead branches that trigger bogus -Warray-bounds warnings. libstdc++-v3/ChangeLog: PR libstdc++/107852 PR libstdc++/106199 PR libstdc++/100366 * include/bits/vector.tcc (vector::_M_fill_insert): Copy _M_start and _M_finish members before allocating. (vector::_M_default_append): Likewise. (vector::_M_range_insert): Likewise.
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