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-- Haskell provides a standard function, last :: [a] -> a, that returns the last
-- element of a list. From reading the type alone, what are the possible valid
-- behaviours (omitting crashes and infinite loops) that this function could
-- have? What are a few things that this function clearly cannot do?
-- Possible valid behaviours could be
-- - returning the first element of the list
-- - returning an element in the middle of the list
-- - returning the last element of the list
-- ...
-- This function clearly cannot
-- - return an element of the list at a specified index because it has just
-- one parameter
-- - return a sublist of the list
-- - be an identity function (return its argument)
-- ...
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