[commit: stm] master: Give TChan an Eq instance. (6f0311d)

[Simon Marlow]

Repository : ssh://darcs.haskell.org//srv/darcs/packages/stm

On branch  : master

http://hackage.haskell.org/trac/ghc/changeset/6f0311ddf63480ff2bb0b220eea08379e94c950d

>---------------------------------------------------------------

commit 6f0311ddf63480ff2bb0b220eea08379e94c950d
Author: Joey Adams <joeyadams3.14159 at gmail.com>
Date:   Fri Mar 2 21:05:28 2012 -0500

    Give TChan an Eq instance.
    
    TVar, TMVar, TArray, and Chan all have Eq instances.
    Why doesn't TChan have one, too?

>---------------------------------------------------------------

 Control/Concurrent/STM/TChan.hs |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/Control/Concurrent/STM/TChan.hs b/Control/Concurrent/STM/TChan.hs
index 713624e..7c30dd8 100644
--- a/Control/Concurrent/STM/TChan.hs
+++ b/Control/Concurrent/STM/TChan.hs
@@ -48,7 +48,7 @@ import Data.Typeable (Typeable)
 -- | 'TChan' is an abstract type representing an unbounded FIFO channel.
 data TChan a = TChan _UPK_(TVar (TVarList a))
                      _UPK_(TVar (TVarList a))
-  deriving Typeable
+  deriving (Eq, Typeable)
 
 type TVarList a = TVar (TList a)
 data TList a = TNil | TCons a _UPK_(TVarList a)