{"ast_node_type":"variable","tokens":[{"end":62,"kind":"keyword","start":0,"text":"let"}]}
                let not_low_and_not_high = not_low & not_high;
                let not_high = self.context.new_unary_op(self.location, UnaryOp::LogicalNegate, self.u64_type, high);
                let index = not_low + not_low_and_not_high;