{"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"AssertMessage::OverflowNeg(op)"}]}
        AssertMessage::OverflowNeg(op) => {
        AssertMessage::Overflow(op, _, _) => unreachable!("`{:?}` cannot overflow", op),
            let pretty_op = pretty_operand(op);