It will catch any problem that causes the test script to not run to completion. If you're thinking about problems with shortened loops, I generally already test them with something like:
is($loop_count, 10, "Loop ran 10 times");
That's a case of manual counting that makes sense to me, and it's close enough to the code it references to be easy to maintain. Plus, when it fails I know exactly which loop ran short. When you get a failure from a global count you don't have a clue as to where in the test file to look.
But I'm just guessing here. What problems are you suggesting?
-sam
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