X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2FOptionalConfiguration.hs;h=4faff205cfd416318a2bbc0fb03fa833fbd34100;hb=1585e5bef7e46666a8f026a00884323c9834565b;hp=2d74d27965e1281f0e816ae45500af9221f67440;hpb=39e047ccd8422207e01247c63f514c40e7eac31e;p=mailbox-count.git

diff --git a/src/OptionalConfiguration.hs b/src/OptionalConfiguration.hs
index 2d74d27..4faff20 100644
--- a/src/OptionalConfiguration.hs
+++ b/src/OptionalConfiguration.hs
@@ -20,7 +20,8 @@ import qualified Data.Configurator as DC (
   lookup )
 import Data.Data ( Data )
 import Data.Typeable ( Typeable )
-import Data.Monoid ( Monoid(..) )
+import Data.Monoid ( Monoid() )
+import Data.Semigroup ( Semigroup() )
 import Paths_mailbox_count ( getSysconfDir )
 import System.Directory ( getHomeDirectory )
 import System.FilePath ( (</>) )
@@ -75,8 +76,9 @@ instance Monoid OptionalConfiguration where
              Nothing
              Nothing
 
+instance Semigroup OptionalConfiguration where
   -- | Combine @cfg1@ and @cfg2@, giving precedence to @cfg2@.
-  cfg1 `mappend` cfg2 =
+  cfg1 <> cfg2 =
     OptionalConfiguration
       (merge_maybes (database cfg1) (database cfg2))
       (merge_maybes (detail cfg1) (detail cfg2))