+instance (ExprSet es, CommonExprSet es) => CommonExpr (CommonSetOp es)
+instance VariableSet (HConcat (HMap ApplyMentionedVarsOf es)) =>
+ MentionedVars (CommonSetOp es) where
+ type MentionedVarsOf (CommonSetOp es)
+ = HConcat (HMap ApplyMentionedVarsOf es)