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+[[!comment format=mdwn
+ username="https://www.google.com/accounts/o8/id?id=AItOawnq-RfkVpFN15SWvQ2lpSGAi0XpNQuLxKM"
+ nickname="Yuval"
+ subject="What about safe?"
+ date="2014-07-06T10:44:05Z"
+ content="""
+https://hackage.haskell.org/package/safe
+
+> A library wrapping Prelude/Data.List functions that can throw exceptions, such as head and !!. Each unsafe function has up to four variants, e.g. with tail:
+> 
+>     tail :: [a] -> [a], raises an error on tail [].
+
+>     tailMay :: [a] -> Maybe [a], turns errors into Nothing.
+
+>     tailDef :: [a] -> [a] -> [a], takes a default to return on errors.
+
+>     tailNote :: String -> [a] -> [a], takes an extra argument which supplements the error message.
+
+>     tailSafe :: [a] -> [a], returns some sensible default if possible, [] in the case of tail. 
+"""]]