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Within LTS Haskell 24.32 (ghc-9.10.3)

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1. rightToMaybe :: Either a b -> Maybe b

   ghc	GHC.Data.Maybe

   No documentation available.

2. runMaybeT :: MaybeT (m :: Type -> Type) a -> m (Maybe a)

   ghc	GHC.Data.Maybe

   No documentation available.

3. tryMaybeT :: IO a -> MaybeT IO a

   ghc	GHC.Data.Maybe

   Try performing an IO action, failing on error.

4. fromMaybe :: a -> Maybe a -> a

   ghc	GHC.Data.Strict

   No documentation available.

5. filterMaybe :: (a -> Bool) -> Maybe a -> Maybe a

   ghc	GHC.Data.TrieMap

   No documentation available.

6. foldMaybe :: (a -> b -> b) -> Maybe a -> b -> b

   ghc	GHC.Data.TrieMap

   No documentation available.

7. apMaybeUB :: MaybeUB (a -> b) -> MaybeUB a -> MaybeUB b

   ghc	GHC.Data.Unboxed

   No documentation available.

8. fmapMaybeUB :: (a -> b) -> MaybeUB a -> MaybeUB b

   ghc	GHC.Data.Unboxed

   No documentation available.

9. fromMaybeUB :: a -> MaybeUB a -> a

   ghc	GHC.Data.Unboxed

   No documentation available.

10. mapMaybe :: (a -> Maybe b) -> Word64Map a -> Word64Map b

    ghc	GHC.Data.Word64Map.Internal

    Map values and collect the Just results.

    let f x = if x == "a" then Just "new a" else Nothing
    mapMaybe f (fromList [(5,"a"), (3,"b")]) == singleton 5 "new a"
    

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