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They claim that it's not what others are doing, but coffeescript is doing it, and it's quite possible that ECMAScript will get it in the future.

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Haskell does it, apparently choosing \x -> y from Miranda's type signatures over ML's fn x => y. Of course, Haskell proceeds to x <- y -< z and then starts to go a bit peculiar.

http://www.haskell.org/haskellwiki/Arrow

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