相关疑难解决方法(0)

由于分号在Rust中显然是可选的,为什么,如果我这样做:

fn fn1() -> i32 {    
    let a = 1
    let b = 2
    3
}

我收到错误:

error: expected one of `.`, `;`, `?`, or an operator, found `let`
 --> src/main.rs:3:9
  |
2 |         let a = 1
  |                  - expected one of `.`, `;`, `?`, or an operator here
3 |         let b = 2
  |         ^^^ unexpected token

？