Don't use exceptions for flow control: http://c2.com/cgi/wiki?DontUseExceptionsForFlowControl Depending on you perspective, calling last on an empty sequence is: - A mistake -> You should check the sequence before you call last. Otherwise you might depend on exceptions for flow control. - Correct -> You don't like an exception, but like a nil return. Otherwise you are forced to depend on exceptions for flow control.
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