# 错误[E0626]：模式守卫求值时，借用可能仍在使用中

- **ID:** `rust/e0626-borrow-in-pattern-guard`
- **领域:** rust
- **类别:** type_error
- **错误码:** `E0626`
- **验证级别:** ai_generated
- **修复率:** 82%

## 根因

`match` 分支的守卫条件中的借用可能在守卫求值时仍处于活动状态，因为编译器无法保证借用能在守卫运行前释放，可能导致别名冲突。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| rustc 1.73.0 | active | — | — |
| rustc 1.75.0 | active | — | — |
| rustc 1.78.0 | active | — | — |

## 解决方案

1. ```
   Refactor the guard condition to use a separate `if let` or a function that takes ownership or a reference with a shorter lifetime.
   ```
2. ```
   Bind the value with a reference pattern and then use a separate condition outside the match, e.g., using `matches!` macro.
   ```
3. ```
   Use a `match` with a guard that does not borrow, e.g., by copying a boolean flag or using a method that returns a value without borrowing.
   ```

## 无效尝试

- **** — Cloning creates a new value but the borrow of the original may still be active in the guard's scope; the compiler still sees the borrow. (55% 失败率)
- **** — Unsafe code can bypass borrow checking but introduces memory safety risks; the compiler still emits the error in safe code. (65% 失败率)