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-rw-r--r--XMonad/Layout.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/XMonad/Layout.hs b/XMonad/Layout.hs
index 8e5dc95..18c72e7 100644
--- a/XMonad/Layout.hs
+++ b/XMonad/Layout.hs
@@ -112,7 +112,7 @@ splitVerticallyBy f = (mirrorRect *** mirrorRect) . splitHorizontallyBy f . mirr
------------------------------------------------------------------------
-- | Mirror a layout, compute its 90 degree rotated form.
-data Mirror l a = Mirror (l a) deriving (Show, Read)
+newtype Mirror l a = Mirror (l a) deriving (Show, Read)
instance LayoutClass l a => LayoutClass (Mirror l) a where
runLayout (W.Workspace i (Mirror l) ms) r = (map (second mirrorRect) *** fmap Mirror)