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| author | Herbert Valerio Riedel <hvr@gnu.org> | 2015-12-31 16:42:38 +0100 |
|---|---|---|
| committer | Herbert Valerio Riedel <hvr@gnu.org> | 2015-12-31 22:38:52 +0100 |
| commit | 3c8cb7f43c89e9a2b754adc5e639985f0b95b1f1 (patch) | |
| tree | 7c027a215ed2b15fd66ce99ca533cc9348df745e /compiler/utils/Maybes.hs | |
| parent | 2f923ce2ab8bad6d01645c735c81bbf1b9ff1e05 (diff) | |
| download | haskell-3c8cb7f43c89e9a2b754adc5e639985f0b95b1f1.tar.gz | |
Remove some redundant definitions/constraints
Starting with GHC 7.10 and base-4.8, `Monad` implies `Applicative`,
which allows to simplify some definitions to exploit the superclass
relationship. This a first refactoring to that end.
Diffstat (limited to 'compiler/utils/Maybes.hs')
| -rw-r--r-- | compiler/utils/Maybes.hs | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/compiler/utils/Maybes.hs b/compiler/utils/Maybes.hs index ac5107029b..83dc9b6864 100644 --- a/compiler/utils/Maybes.hs +++ b/compiler/utils/Maybes.hs @@ -17,7 +17,6 @@ module Maybes ( MaybeT(..), liftMaybeT ) where -import Control.Applicative as A import Control.Monad import Control.Monad.Trans.Maybe import Data.Maybe @@ -84,7 +83,6 @@ instance Applicative (MaybeErr err) where (<*>) = ap instance Monad (MaybeErr err) where - return = A.pure Succeeded v >>= k = k v Failed e >>= _ = Failed e |