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Haskell error parse error on input `='
... in GHCi, so OP's code will work without change.
GHCi, version 8.0.1.20161213: http://www.haskell.org/ghc/ :? for help
Prelude> f x = x * 2
Prelude> f 4
8
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...ry as the open file.
– loevborg
Nov 21 '13 at 13:04
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@Ioevborg when is that not the case? I just...