OK, what do you call this? "Re-bugging"?

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I typed in some C++ code from Stroustrup's programming book. It is supposed to be the naive, inadequate first cut at addressing a problem. He offers some input that will show the shortcomings of the naive approach. I type in that input and...

It works perfectly!

Now I have to "re-bug" my program to determine why it is not failing like it is supposed to!

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