#2182: ghci session retains instances after :m -Module
------------------------+---------------------------------------------------
Reporter: claus | Owner:
Type: bug | Status: new
Priority: normal | Component: GHCi
Version: 6.9 | Severity: normal
Keywords: | Testcase:
Architecture: Unknown | Os: Unknown
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{{{
$ compiler/stage2/ghc-inplace --interactive
GHCi, version 6.9.20080317: http://www.haskell.org/ghc/ :? for help
Loading package base ... linking ... done.
Prelude> :i Functor
class Functor f where fmap :: (a -> b) -> f a -> f b
-- Defined in GHC.Base
instance Functor Maybe -- Defined in Data.Maybe
instance Functor [] -- Defined in GHC.Base
instance Functor IO -- Defined in GHC.IOBase
Prelude> fmap not (True,True)
<interactive>:1:0:
No instance for (Functor ((,) Bool))
arising from a use of `fmap' at <interactive>:1:0-19
Possible fix: add an instance declaration for (Functor ((,) Bool))
In the expression: fmap not (True, True)
In the definition of `it': it = fmap not (True, True)
Prelude> :m +Data.Array
Prelude Data.Array> :i Functor
class Functor f where fmap :: (a -> b) -> f a -> f b
-- Defined in GHC.Base
instance (Ix i) => Functor (Array i) -- Defined in GHC.Arr
instance Functor ((->) r) -- Defined in Control.Monad.Instances
instance Functor ((,) a) -- Defined in Control.Monad.Instances
instance Functor (Either a) -- Defined in Control.Monad.Instances
instance Functor Maybe -- Defined in Data.Maybe
instance Functor [] -- Defined in GHC.Base
instance Functor IO -- Defined in GHC.IOBase
Prelude Data.Array> fmap not (True,True)
(True,False)
Prelude Data.Array> :m -Data.Array
Prelude> :i Functor
class Functor f where fmap :: (a -> b) -> f a -> f b
-- Defined in GHC.Base
instance Functor ((->) r) -- Defined in Control.Monad.Instances
instance Functor ((,) a) -- Defined in Control.Monad.Instances
instance Functor (Either a) -- Defined in Control.Monad.Instances
instance Functor Maybe -- Defined in Data.Maybe
instance Functor [] -- Defined in GHC.Base
instance Functor IO -- Defined in GHC.IOBase
Prelude> fmap not (True,True)
(True,False)
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2182>
GHC <http://www.haskell.org/ghc/>
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