Fix some "warn-unused-do-bind" warnings where we want to ignore the value

[ghc-base.git] / Control / Concurrent / SampleVar.hs

diff --git a/Control/Concurrent/SampleVar.hs b/Control/Concurrent/SampleVar.hs
index 69c29c2..a76346f 100644 (file)
--- a/Control/Concurrent/SampleVar.hs
+++ b/Control/Concurrent/SampleVar.hs
@@ -61,8 +61,7 @@ newEmptySampleVar = do
 -- |Build a 'SampleVar' with an initial value.
 newSampleVar :: a -> IO (SampleVar a)
 newSampleVar a = do
-   v <- newEmptyMVar
-   putMVar v a
+   v <- newMVar a
    newMVar (1,v)
 
 -- |If the SampleVar is full, leave it empty.  Otherwise, do nothing.
@@ -70,7 +69,7 @@ emptySampleVar :: SampleVar a -> IO ()
 emptySampleVar v = do
    (readers, var) <- takeMVar v
    if readers > 0 then do
-     takeMVar var
+     _ <- takeMVar var
      putMVar v (0,var)
     else
      putMVar v (readers,var)