[mypy] Remove now useless type alias

rql/rqltypes.py

@@ -183,25 +183,3 @@ AnyScopeNode = Union_[
     "rql.stmts.Select",
     "rql.stmts.Select",
 ]
-
-Op = Union_[
-    "rql.undo.NodeOperation",
-    "rql.undo.MakeVarOperation",
-    "rql.undo.UndefineVarOperation",
-    "rql.undo.SelectVarOperation",
-    "rql.undo.UnselectVarOperation",
-    "rql.undo.AddNodeOperation",
-    "rql.undo.ReplaceNodeOperation",
-    "rql.undo.RemoveNodeOperation",
-    "rql.undo.AddSortOperation",
-    "rql.undo.RemoveSortOperation",
-    "rql.undo.AddGroupOperation",
-    "rql.undo.RemoveGroupOperation",
-    "rql.undo.SetDistinctOperation",
-    "rql.undo.SetOffsetOperation",
-    "rql.undo.SetLimitOperation",
-    "rql.undo.SetOptionalOperation",
-    "rql.undo.SetHavingOperation",
-    "rql.undo.AppendSelectOperation",
-    "rql.undo.RemoveSelectOperation",
-]