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The PR shows a bogus warning where jump threading generates code for the undefined case that the insertion point is a value-initialized iterator but _M_finish and _M_end_of_storage are unequal (so at least one must be non-null). Using __builtin_unreachable() removes the bogus warning. Also add an assertion to diagnose undefined misuses of a null iterator here, so we don't just silently optimize that undefined code to something unsafe. libstdc++-v3/ChangeLog: PR c++/106434 * include/bits/vector.tcc (insert(const_iterator, const T&)): Add assertion and optimization hint that the iterator for the insertion point must be non-null.
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