diff --git a/mercurial/context.py b/mercurial/context.py
--- a/mercurial/context.py
+++ b/mercurial/context.py
@@ -466,12 +466,7 @@ class changectx(basectx):
             (source == 'compatibility' and
              self._changeset.filesremoved is not None)):
             return self._changeset.filesremoved or []
-
-        removed = []
-        for f in self.files():
-            if f not in self:
-                removed.append(f)
-        return removed
+        return scmutil.computechangesetfilesremoved(self)
 
     @propertycache
     def _copies(self):
diff --git a/mercurial/scmutil.py b/mercurial/scmutil.py
--- a/mercurial/scmutil.py
+++ b/mercurial/scmutil.py
@@ -1993,3 +1993,12 @@ def computechangesetfilesadded(ctx):
         if not any(f in p for p in ctx.parents()):
             added.append(f)
     return added
+
+def computechangesetfilesremoved(ctx):
+    """return the list of files removed in a changeset
+    """
+    removed = []
+    for f in ctx.files():
+        if f not in ctx:
+            removed.append(f)
+    return removed