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add ArrowChoice=>GArrowSum instance
[ghc-base.git]
/
GHC
/
IO
/
Exception.hs-boot
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{-# LANGUAGE NoImplicitPrelude #-}
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module GHC.IO.Exception where
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import GHC.Base
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import GHC.Exception
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data IOException
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instance Exception IOException
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type IOError = IOException
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userError :: String -> IOError
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unsupportedOperation :: IOError