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    my $outfile = "a";
    $outfile++ while -e $outfile;
    open my $fh, ">", $outfile or die "$outfile: $!";

    my $outfile = "a";
    my $fh;
    $outfile++ until sysopen $fh, $outfile, O_WRONLY|O_CREAT|O_EXCL;