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Use more succinct definition

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Taylor Fausak 2021-05-28 16:03:47 -04:00 committed by GitHub
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src/lib/Witch/Instances.hs
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@ -254,9 +254,7 @@ instance TryFrom.TryFrom Int.Int64 Natural.Natural where
-- This should use @eitherTryFrom fromNonNegativeIntegral@, but that causes
-- a bug in GHC 9.0.1.
-- https://mail.haskell.org/pipermail/haskell-cafe/2021-March/133540.html
tryFrom s = case TryFrom.tryFrom (From.from s :: Integer) of
Left (TryFromException.TryFromException _ e) -> Left $ TryFromException.TryFromException s e
Right t -> Right t
tryFrom = Utility.eitherTryFrom $ \ s -> TryFrom.tryFrom (From.from s :: Integer)
-- | Uses 'fromIntegral' when the input is between -16,777,215 and 16,777,215
-- inclusive.