first_idx        2072 maint/gnulib/lib/regexec.c   Idx first_idx = search_cur_bkref_entry (mctx, str_idx);
first_idx        2074 maint/gnulib/lib/regexec.c   if (first_idx == -1)
first_idx        2092 maint/gnulib/lib/regexec.c       entry = mctx->bkref_ents + first_idx;
first_idx        2093 maint/gnulib/lib/regexec.c       enabled_idx = first_idx;