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Diffstat (limited to 'XMonad/Util/Invisible.hs')
| -rw-r--r-- | XMonad/Util/Invisible.hs | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/XMonad/Util/Invisible.hs b/XMonad/Util/Invisible.hs index fc18180..2fa8b2b 100644 --- a/XMonad/Util/Invisible.hs +++ b/XMonad/Util/Invisible.hs @@ -22,13 +22,15 @@ module XMonad.Util.Invisible ( , fromIMaybe ) where +import Control.Applicative + -- $usage -- A wrapper data type to store layout state that shouldn't be persisted across -- restarts. A common wrapped type to use is @Maybe a@. -- Invisible derives trivial definitions for Read and Show, so the wrapped data -- type need not do so. -newtype Invisible m a = I (m a) deriving (Monad, Functor) +newtype Invisible m a = I (m a) deriving (Monad, Applicative, Functor) instance (Functor m, Monad m) => Read (Invisible m a) where readsPrec _ s = [(fail "Read Invisible", s)] |