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We hadn't noticed this violation of -Wshadow=compatible-local because this function isn't compiled without -DTRGM_REGEXP_DEBUG. As long as we have to clean it up, let's do so by converting all this function's loops to use C99 loop-local control variables. Reported-by: Sergei Kornilov <sk@zsrv.org> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/3009911772478436@08341ecb-668d-43a9-af4d-b45f00c72521