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-rw-r--r--Git/Tree.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/Git/Tree.hs b/Git/Tree.hs
index ea48a1f12..3ef3f6870 100644
--- a/Git/Tree.hs
+++ b/Git/Tree.hs
@@ -149,7 +149,7 @@ treeItemsToTree = go M.empty
- this avoids buffering the whole tree in memory.
-}
adjustTree
- :: (MonadIO m, MonadMask m)
+ :: (Functor m, MonadIO m, MonadMask m)
=> (TreeItem -> m (Maybe TreeItem))
-- ^ Adjust an item in the tree. Nothing deletes the item.
-- Cannot move the item to a different tree.