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Monoid instance of Maybe is not what you think it is

This commit is contained in:
Timo von Holtz 2015-05-01 17:31:38 +10:00
parent 48ab0ea420
commit 9f2ddc8599
1 changed files with 2 additions and 1 deletions
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3
lib/Servant/Ekg.hs
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@ -10,6 +10,7 @@ module Servant.Ekg where
import Control.Concurrent.MVar
import Control.Exception
import Control.Monad
import qualified Data.HashMap.Strict as H
import Data.Monoid
import Data.Proxy
@ -98,7 +99,7 @@ class HasEndpoint a where
instance (HasEndpoint (a :: *), HasEndpoint (b :: *)) => HasEndpoint (a :<|> b) where
getEndpoint _ req =
getEndpoint (Proxy :: Proxy a) req <>
getEndpoint (Proxy :: Proxy a) req `mplus`
getEndpoint (Proxy :: Proxy b) req
instance (KnownSymbol (path :: Symbol), HasEndpoint (sub :: *)) => HasEndpoint (path :> sub) where