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| author | Krzysztof Gogolewski <krzysztof.gogolewski@tweag.io> | 2019-06-08 20:48:07 +0200 |
|---|---|---|
| committer | Krzysztof Gogolewski <krzysztof.gogolewski@tweag.io> | 2019-06-09 14:35:50 +0200 |
| commit | 4c44e323e8ac0e28e87e93ab53cbf7eb21ac9c25 (patch) | |
| tree | b0991218e9cac8f76224df017856045c71d779e4 /compiler/utils/Maybes.hs | |
| parent | 8754002973dcde8709458044e541ddc8f4fcf6bb (diff) | |
| download | haskell-wip/derive-functor.tar.gz | |
Use DeriveFunctor throughout the codebase (#15654)wip/derive-functor
Diffstat (limited to 'compiler/utils/Maybes.hs')
| -rw-r--r-- | compiler/utils/Maybes.hs | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/compiler/utils/Maybes.hs b/compiler/utils/Maybes.hs index 14bc46b9b8..37acb25a1a 100644 --- a/compiler/utils/Maybes.hs +++ b/compiler/utils/Maybes.hs @@ -1,5 +1,6 @@ {-# LANGUAGE CPP #-} {-# LANGUAGE ConstraintKinds #-} +{-# LANGUAGE DeriveFunctor #-} {-# LANGUAGE KindSignatures #-} {-# LANGUAGE FlexibleContexts #-} @@ -95,9 +96,7 @@ tryMaybeT action = MaybeT $ catch (Just `fmap` action) handler -} data MaybeErr err val = Succeeded val | Failed err - -instance Functor (MaybeErr err) where - fmap = liftM + deriving (Functor) instance Applicative (MaybeErr err) where pure = Succeeded |