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Prevents uninitialized read bugs, and it's also just natural to assume flags are initially cleared rather than uninitialized. In passing rename the _M_end flag to _M_subexpr_end to make it distinct from _Executor::_M_end. libstdc++-v3/ChangeLog: * include/bits/regex_executor.tcc (_ExecutorFrameBase): Zero-initialize _M_byte0. (_ExecutorFrameBase::_M_end): Rename to ... (_ExecutorFrameBase::_M_subexpr_end): ... this. (_Executor::_M_handle_subexpr_begin): Remove now redundant clearing of _M_subexpr_end. (_Executor::_M_handle_subexpr_end): Adjust after renaming. (_Executor::_M_dfs) <case _S_fopcode_restore_cur_results>: Likewise. Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
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