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What does fixIO do?

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盖世英雄少女心
盖世英雄少女心 2021-02-13 02:10

The System.IO docs contains a mysterious, undocumented function fixIO. Its source only adds to the mystery:

fixIO :: (a -> IO a) -> IO a
fixIO
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  • 既然无缘
    既然无缘 (楼主)
    2021-02-13 02:33

    fixIO is the witness to the MonadFix IO instance. See the HaskellWiki page on MonadFix and the paper A Recursive do for Haskell.

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