...rticle/16322/)
- [The story of three brothers that bankrupted their family and broke the global silver market](https://learnblockchain.cn/article/16274/)
[](https://learnblockchain.cn/article/1632...
...绑定。
```rust
fn main() {
let a = 1;
// a = 2; // immutable and error
let mut b = 2;
b = 3; // mutable
}
```
通过 mut 关键字，可以声明可变的位置表达式，即可变绑定。
可变绑定可以正常修改和赋值。
从语义上来说
let 默认声...