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1. mapMaybeStep :: forall (m :: Type -> Type) a b . Functor m => (a -> Maybe b) -> StepT m a -> StepT m b

   servant	Servant.Types.SourceT

   No documentation available.

2. mapMG :: (ModSummary -> ModSummary) -> ModuleGraph -> ModuleGraph

   ghc	GHC

   Map a function f over all the ModSummaries. To preserve invariants f can't change the isBoot status.

3. mapMap :: (a -> v) -> LabelMap a -> LabelMap v

   ghc	GHC.Cmm.Dataflow.Label

   No documentation available.

4. mapMapWithKey :: (Label -> a -> v) -> LabelMap a -> LabelMap v

   ghc	GHC.Cmm.Dataflow.Label

   No documentation available.

5. mapMember :: Label -> LabelMap a -> Bool

   ghc	GHC.Cmm.Dataflow.Label

   No documentation available.

6. mapMaybeDTyConEnv :: (a -> Maybe b) -> DTyConEnv a -> DTyConEnv b

   ghc	GHC.Core.TyCon.Env

   No documentation available.

7. mapMaybeBag :: (a -> Maybe b) -> Bag a -> Bag b

   ghc	GHC.Data.Bag

   No documentation available.

8. mapMaybeBagM :: Monad m => (a -> m (Maybe b)) -> Bag a -> m (Bag b)

   ghc	GHC.Data.Bag

   No documentation available.

9. mapMaybeFsEnv :: (elt1 -> Maybe elt2) -> FastStringEnv elt1 -> FastStringEnv elt2

   ghc	GHC.Data.FastString.Env

   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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