{"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"OperandValue::Immediate(_)"}]}
            OperandValue::Immediate(_) | OperandValue::Pair(_, _) => {
            OperandValue::ZeroSized => bug!(),
                self.extract_field(fx, bx, tag_field.as_usize())