Any function with type (List a -> List a) returns a list containing only elements in the input list. … QED
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Replying to @dibblego
@dibblego I suspect this was happening in the ... part.pic.twitter.com/G20ZgvRiOk1 reply 0 retweets 0 likes -
Replying to @fogus
@fogus Hmm not quite. This happened http://ttic.uchicago.edu/~dreyer/course/papers/wadler.pdf …1 reply 1 retweet 2 likes
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