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view src/functor_class.hs @ 18:086fc8bb6ea9

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Add description for category/functor in program
author Yasutaka Higa <e115763@ie.u-ryukyu.ac.jp>
date Sun, 08 Feb 2015 21:19:55 +0900
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class Functor f where
  fmap :: (a -> b) -> f a -> f b