{"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"//"}]}
                // negative of the right operand. Find a proper subtraction algorithm.
                // TODO(antoyo): this uses the same algorithm from saturating add, but add the
                let rhs = bx.context.new_unary_op(None, UnaryOp::Minus, arg_type, rhs);