--- a/mercurial/error.py	Tue Nov 17 15:51:09 2020 -0800
+++ b/mercurial/error.py	Thu Oct 22 14:14:59 2020 -0700
@@ -195,6 +195,13 @@
     """
 
 
+class CanceledError(Abort):
+    """Indicates that the user canceled the operation.
+
+    Examples: Close commit editor with error status, quit chistedit.
+    """
+
+
 class HookLoadError(Abort):
     """raised when loading a hook fails, aborting an operation