It also depends on how neat the perl script is written. If for example (I know it's a weak one) the script uses a defect in the perl language which is solved the script will crash.
Another example (better) is that an ugly perl script might be dependend of when certain processes are finished without checking this. With a new compiler the sequence at which processes are finished might change.
The more the script is build on asumptions the worse it will be.
So the questions is now bounced back: how well written is the perl script?
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