-- Load your lastButOne function into ghci, and try it out on lists of different
-- lengths. What happens when you pass it a list that's too short?

ghci> :l 2_b_2.hs
[1 of 1] Compiling Main             ( 2_b_2.hs, interpreted )
Ok, one module loaded.
ghci> lastButOne [1, 2, 3, 4]
3
ghci> lastButOne [1, 2, 3]
2
ghci> lastButOne [1, 2]
1
ghci> lastButOne [1]
*** Exception: Prelude.tail: empty list