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Within LTS Haskell 24.6 (ghc-9.10.2)

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  1. maybeHolds :: Property p v => p -> v -> Maybe v

    data-checked Data.Checked

    Return Just v if p holds and Nothing overwise.

  2. maybeHolds :: Property p v => p -> v -> Maybe v

    data-checked Data.Checked.Strict

    Return Just v if p holds and Nothing overwise.

  3. maybeM :: Monad m => m b -> (a -> m b) -> m (Maybe a) -> m b

    distribution-opensuse OpenSuse.Prelude

    Monadic generalisation of maybe.

  4. maybeToExceptS :: forall (m :: Type -> Type) a b . (Functor m, Monad m) => MSF (MaybeT m) a b -> MSF (ExceptT () m) a b

    dunai Control.Monad.Trans.MSF.Except

    Converts an MSF in MaybeT to an MSF in ExceptT. Whenever Nothing is thrown, throw () instead.

  5. maybeExit :: forall (m :: Type -> Type) a . Monad m => MSF (MaybeT m) (Maybe a) a

    dunai Control.Monad.Trans.MSF.Maybe

    Just a is passed along, Nothing causes the whole MSF to exit.

  6. maybeToExceptS :: forall (m :: Type -> Type) a b . (Functor m, Monad m) => MSF (MaybeT m) a b -> MSF (ExceptT () m) a b

    dunai Control.Monad.Trans.MSF.Maybe

    Converts an MSF in MaybeT to an MSF in ExceptT. Whenever Nothing is thrown, throw () instead.

  7. maybeToExceptT :: forall (m :: Type -> Type) e a . Functor m => e -> MaybeT m a -> ExceptT e m a

    dunai Control.Monad.Trans.MSF.Maybe

    Convert a MaybeT computation to ExceptT, with a default exception value.

  8. maybeModTime :: FilePath -> IO (Maybe UTCTime)

    dyre Config.Dyre.Paths

    Check if a file exists. If it exists, return Just the modification time. If it doesn't exist, return Nothing.

  9. maybeEither :: Maybe a -> Either () a

    errors-ext Control.Error.Extensions

    Converts Maybe to Either. Specialization of maybe. 

    maybeEither . eitherMaybe = id

  10. maybeInjectExecutableHash :: FilePath -> IO ()

    executable-hash System.Executable.Hash.Internal

    Injects an executable hash into the specified binary. If it doesn't exist, then this prints a message to stdout indicating that it failed to inject the hash.

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