{"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"if"}]}
                if p.eat_keyword(exp!(Underscore)) { None } else { Some(p.parse_expr()?) };
            let out_expr =
            ast::InlineAsmOperand::SplitInOut { reg, in_expr: expr, out_expr, late: false }