...编译!
```rust
let op1 = sum;
let op2 = sum;
// Both op1 and op2 are of a type that cannot be named in user code,
// and this internal type does not implement `Eq`.
assert!(op1 == op2);
```
```rust
error[E0369]: binary operation `==` cannot be app...
...原始标记和名称 |
| --- | --- |
|  | ![**加粗** DO use a original mark and name](https://img.learnblockchain.cn/2025/05/08/13-07e6101da77a01f562c62a5f9...