The OP's question does not make much sense when viewing it from a theoretical point of view (as anyone who understands Turing completeness knows and your post explains). I can as much write perl in Perl as I can carve my name onto the face of the moon with a toothpick or tattoo "I blow goats" onto the forehead of my least-favourite head of state. Both of these things would be possible if I dedicated my life to them and managed to obtain the support of a large enough community of people. I would however consider them to be practical impossibilities. Rewriting perl in Perl has pretty much the same prerequisites and is just as impossible. Do feel free to prove me wrong though :-)
Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it. -- Brian W. Kernighan
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