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{-# OPTIONS_GHC -Wincomplete-patterns -fforce-recomp #-}
{-# LANGUAGE ViewPatterns #-}
module Lib where
safeLast :: [a] -> Maybe a
safeLast xs
| [] <- reverse xs = Nothing
| (x:_) <- reverse xs = Just x
safeLast2 :: [a] -> Maybe a
safeLast2 (reverse -> []) = Nothing
safeLast2 (reverse -> (x:_)) = Just x
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