It can be proved(philosophically) that a complete Perl 6 implementation can be written by Larry Wall and nobody else.
I have been reading a lot of stuff on this forum like Perl cannot be parsed, Only Perl can parse perl. If Parsing Perl is really so difficult that only a binary executable called 'perl' written by Larry Wall can parse it, and nothing else... Then only Larry Wall has the powers as a mortal being to write another such program again.
I may be wrong here, but thats what I felt after reading the statement 'Only perl can parse perl'.
In reply to A philosophical proof that, a perl6 implementation can be written only by Larry Wall by Anonymous Monk
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