fix build with ghc 7.6.3
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@ -149,7 +149,7 @@ treeItemsToTree = go M.empty
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- this avoids buffering the whole tree in memory.
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-}
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adjustTree
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:: (MonadIO m, MonadMask m)
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:: (Functor m, MonadIO m, MonadMask m)
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=> (TreeItem -> m (Maybe TreeItem))
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-- ^ Adjust an item in the tree. Nothing deletes the item.
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-- Cannot move the item to a different tree.
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