fix build with old ghc

This commit is contained in:
Joey Hess 2016-12-30 11:10:20 -04:00
parent d785a565ef
commit 3ec1478767
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@ -36,6 +36,8 @@ import Control.Concurrent
import Control.Exception
import Data.Char
import Data.List
import Control.Applicative
import Prelude
-- | A Magic Wormhole code.
newtype Code = Code String