IN_ROOT          3872 regcomp.c        int in_root = state & IN_ROOT;
IN_ROOT          3874 regcomp.c        state &= ~IN_ROOT;
IN_ROOT          3889 regcomp.c      	prev_in_root = state & IN_ROOT;
IN_ROOT          3890 regcomp.c      	state &= ~IN_ROOT;
IN_ROOT          5779 regcomp.c        r = setup_tree(root, reg, IN_ROOT, &scan_env);