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puffnfresh/gist:5163683

Forked from fogus/gist:5163546
Created March 14, 2013 18:05
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gistfile1.hs
data GenericThing = SpecificThing Char | BadThing
isSpecificThing :: GenericThing -> Bool
isSpecificThing (SpecificThing _) = True
isSpecificThing _ = False
foo :: [GenericThing] -> GenericThing
foo xs
| null xs = error "Empty GenericThings"
| all isSpecificThing xs = head xs
| otherwise = last xs
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