X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=Control%2FConcurrent%2FSampleVar.hs;h=7d1a00d7fe6f5fd77a0552a3477a070725497525;hb=6528f4e902ce806f6c6b394aad7084452df33e06;hp=68e4b308d69bb76f2eb33944425b785ec98329aa;hpb=a0f41d471ceda7da65d775cfd9eaca3262ec8291;p=ghc-base.git

diff --git a/Control/Concurrent/SampleVar.hs b/Control/Concurrent/SampleVar.hs
index 68e4b30..7d1a00d 100644
--- a/Control/Concurrent/SampleVar.hs
+++ b/Control/Concurrent/SampleVar.hs
@@ -34,6 +34,10 @@ import Control.Exception ( mask_ )
 
 import Data.Functor ( (<$>) )
 
+import Data.Typeable
+
+#include "Typeable.h"
+
 -- |
 -- Sample variables are slightly different from a normal 'MVar':
 -- 
@@ -58,6 +62,8 @@ newtype SampleVar a = SampleVar ( MVar ( Int    -- 1  == full
                                 )
     deriving (Eq)
 
+INSTANCE_TYPEABLE1(SampleVar,sampleVarTc,"SampleVar")
+
 -- |Build a new, empty, 'SampleVar'
 newEmptySampleVar :: IO (SampleVar a)
 newEmptySampleVar = do