Bryan O'Sullivan avatar Bryan O'Sullivan committed e87ecb2

Fix a compilation warning

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Files changed (1)

Database/MySQL/Simple.hs

 -- 'Base.rollback', then the exception will be rethrown.
 withTransaction :: Connection -> IO a -> IO a
 withTransaction conn act = do
-  execute_ conn "start transaction"
+  _ <- execute_ conn "start transaction"
   r <- act `onException` Base.rollback conn
   Base.commit conn
   return r
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