中文文档中的示例 10-24 fn main() { let string1 = String::from("long string is long"); let result; { let string2 = String::from("xyz"); result = longest(string1.as_str(), string2.as_str()); } println!("The longest string is {}", result); } fn longest<'a>(x: &'a str, y: &'a str) -> &'a str { if x.len() > y.len() { x } else { y } } 会出现string2 does not live long enough。 可是将 let string1 ="long string is long"; { let string2 = "xyz"; //如上 } 改成这样却能正确输出结果