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    $ perl -MO=Deparse  -lpe '' file

    LINE: while (defined($_ = <ARGV>)) {
...
        print $_;
    }

    $ perl -MO=Deparse  -lpe '}{*_=*.}{' file

    LINE: while (defined($_ = <ARGV>)) {
...
    continue {
        die "-p destination: $!\n" unless print $_;
    }