base: drop redundant Typeable derivings

Thanks to #9858 `Typeable` doesn't need to be explicitly derived anymore.
This also makes `AutoDeriveTypeable` redundant, as well as some imports of
`Typeable` (removal of whose may be beneficial to #9707). This commit
removes several such now redundant use-sites in `base`.

Reviewed By: austin, ekmett

Differential Revision: https://phabricator.haskell.org/D712

1 files changed, 2 insertions, 3 deletions

diff --git a/libraries/base/GHC/MVar.hs b/libraries/base/GHC/MVar.hs
index a5054cc8fe..911c024128 100644
--- a/libraries/base/GHC/MVar.hs
+++ b/libraries/base/GHC/MVar.hs
@@ -1,5 +1,5 @@
 {-# LANGUAGE Unsafe #-}
-{-# LANGUAGE NoImplicitPrelude, MagicHash, UnboxedTuples, AutoDeriveTypeable #-}
+{-# LANGUAGE NoImplicitPrelude, MagicHash, UnboxedTuples #-}
 {-# OPTIONS_GHC -funbox-strict-fields #-}
 {-# OPTIONS_HADDOCK hide #-}
 
@@ -33,9 +33,8 @@ module GHC.MVar (
     ) where
 
 import GHC.Base
-import Data.Typeable
 
-data MVar a = MVar (MVar# RealWorld a) deriving( Typeable )
+data MVar a = MVar (MVar# RealWorld a)
 {- ^
 An 'MVar' (pronounced \"em-var\") is a synchronising variable, used
 for communication between concurrent threads.  It can be thought of