To Really Foul Things Up Requires a Computer
We should pay some more attention to the notion of program failure, as it's very important. The first question, of course, is what it means to say that a program "fails". The best answer is that it doesn't work correctly, but that isn't very specific.
As you can imagine, this notion was the topic of some discussion with Susan:
Susan: What do you mean by a program failing? I know it means it won't work, but what happens? Do you just get error messages, and it won't do anything? Or is it like the message that you have on page 187?
Steve: In general, a program "failing" means that it does something unexpected and erroneous. Because I have put some safety features into the implementation of vector,
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