{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"ast::InlineAsmOperand::Out"}]}
        ast::InlineAsmOperand::Out { reg, expr, late: false }
        let expr = if p.eat_keyword(exp!(Underscore)) { None } else { Some(p.parse_expr()?) };
    } else if eat_operand_keyword(p, exp!(Lateout), asm_macro)? {