diff -r 6877b0ee5f9d -r 590a840fa367 mercurial/sparse.py
--- a/mercurial/sparse.py	Wed Sep 09 16:49:19 2020 +0530
+++ b/mercurial/sparse.py	Wed Sep 16 18:09:32 2020 +0530
@@ -399,7 +399,7 @@
             temporaryfiles.append(file)
             prunedactions[file] = action
         elif branchmerge:
-            if type not in mergemod.mergeresult.NO_OP_ACTIONS:
+            if type not in mergestatemod.NO_OP_ACTIONS:
                 temporaryfiles.append(file)
                 prunedactions[file] = action
         elif type == mergestatemod.ACTION_FORGET: