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1. mapWriter :: ((a, w) -> (b, w')) -> Writer w a -> Writer w' b

   mtl-prelude	MTLPrelude

   Map both the return value and output of a computation using the given function.

   • runWriter (mapWriter f m) = f (runWriter
     m)

2. mapWriterT :: (m (a, w) -> n (b, w')) -> WriterT w m a -> WriterT w' n b

   mtl-prelude	MTLPrelude

   Map both the return value and output of a computation using the given function.

   • runWriterT (mapWriterT f m) = f
     (runWriterT m)

3. mapParseError :: Ord e' => (e -> e') -> ParseError s e -> ParseError s e'

   network-uri-template	Network.URI.Template.Internal.Parse

   Modify the custom data component in a parse error. This could be done via fmap if not for the Ord constraint.

4. maple :: OEISSeq -> Texts

   oeis2	Math.OEIS

   No documentation available.

5. maple :: OEISSeq -> Texts

   oeis2	Math.OEIS.Types

   No documentation available.

6. mapMaybeFieldsWithNulls :: ProductProfunctor p => p (Field SqlBool) (Field SqlBool) -> WithNulls p a b -> WithNulls p (MaybeFields a) (MaybeFields b)

   opaleye	Opaleye.Internal.MaybeFields

   This is only safe if b is OK with having nulls passed through it when they claim to be non-null.

7. mapIO :: HasCallStack => (a -> IO b) -> Parser a -> Parser b

   opt-env-conf	OptEnvConf

   Apply a computation to the result of a parser This is intended for use-cases like resolving a file to an absolute path. It is morally ok for read-only IO actions but you will have a bad time if the action is not read-only.

8. mapIO :: HasCallStack => (a -> IO b) -> Parser a -> Parser b

   opt-env-conf	OptEnvConf.Parser

   Apply a computation to the result of a parser This is intended for use-cases like resolving a file to an absolute path. It is morally ok for read-only IO actions but you will have a bad time if the action is not read-only.

9. mapMaybeBuilder :: (BuildInstruction a -> Maybe (BuildInstruction b)) -> Builder a -> Builder b

   opt-env-conf	OptEnvConf.Setting

   No documentation available.

10. mapValidationFailure :: (e1 -> e2) -> Validation e1 a -> Validation e2 a

    opt-env-conf	OptEnvConf.Validation

    No documentation available.

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