How about using a source filter? Maybe something like: 
use Filter::Simple;
FILTER_ONLY
  code_no_comments => sub { $]<5.009004 && s/\bUNITCHECK\b/CHECK/g };

[download]

In reply to Re: A fail-over UNITCHECK for non-bleadperl by smammy
in thread A fail-over UNITCHECK for non-bleadperl by diotalevi

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