37     upper_.emplace(std::move(*u));
54   if (upper_) {  in upper()
55     return {upper_.value().value()};  in upper()
61   upper_.emplace(std::move(expr));  in set_upper()
145   if (upper_) {  in upper()
146     return upper_.value().value();  in upper()
161   upper_.emplace(std::move(expr));  in set_upper()
166   if (!upper_) {  in Fold()
167     upper_ = upper();  in Fold()
168     if (!upper_) {  in Fold()
172   upper_.value() = evaluate::Fold(context, std::move(upper_.value().value()));  in Fold()
173   std::optional<ConstantSubscript> ubi{ToInt64(upper_.value().value())};  in Fold()
189     upper_ = AsExpr(Constant<SubscriptInteger>{*ubi});  in Fold()
237       upper_ = AsExpr(Constant<SubscriptInteger>{*ubi});  in Fold()
659   return lower_ == that.lower_ && upper_ == that.upper_ &&  in operator ==()
676       upper_ == that.upper_;  in operator ==()