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«This option allows special placeholders, written with a leading underscore (e.g. "_", "_foo", "_bar"), to be used as an expression. During compilation the holes will generate an error message describing what type is expected there, information about the origin of any free type variables, and a list of local bindings that might help fill the hole.» - http://www.haskell.org/ghc/docs/7.8.1/html/users_guide/typed-...
If you ever wanted to know how features like IntelliSense or CodeAssist could look like in a CLI, the fresh Glasgow #Haskell Compiler shows! ‎- 9000

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