Hi Sebastian,
I imagine that many of the instances are defined in the module that
defines the data type. For example, the STM instance is defined in the
same module as the STM type.
Are there any particular ones you're running into problems with?
Take care,
Antoine
On Thu, Dec 9, 2010 at 11:10 PM, Sebastian Fischer
Hello,
according to
http://www.haskell.org/ghc/docs/latest/html/libraries/base/Control-Monad.htm...
Control.Monad exports 20 Functor instance declarations in base-4.3.0.0. However:
bash# ghc-pkg list | grep base base-4.3.0.0 bash# ghci --version The Glorious Glasgow Haskell Compilation System, version 7.0.1 bash# ghci Prelude> import Control.Monad Prelude Control.Monad> :i Functor class Functor f where fmap :: (a -> b) -> f a -> f b (GHC.Base.<$) :: a -> f b -> f a -- Defined in GHC.Base instance Functor Maybe -- Defined in Data.Maybe instance Functor [] -- Defined in GHC.Base instance Functor IO -- Defined in GHC.Base
There are only 3 instances instead of 20. Importing Control.Applicative gives 3 more instances but for example the instance for ((->) r) is still missing.
Is my installation broken? Or has anybody similar problems finding Functor instances in GHC 7?
Sebastian
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