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All the Perl that's Practical to Extract and Report

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  • Let's ignore source filters, because presumably any proof to see if a program halts will necessarily happen on the post-filtered source. (This is regardless of whether you're talking about C+cpp, Lisp + Macros or Perl + Source Filters.) I'm not familiar with any of the formal theories here, but in your (somewhat contrived) example, it should be reasonably easy to tell that the second Perl program terminates. The hard part is when your termination conditions are derived from side effects, like environment