相关疑难解决方法(0)

我有一个包含两个字段的结构,我想使用另一个字段(不可变借用)修改一个字段(可变借用),但是我从借用检查器得到一个错误.

例如,以下代码:

struct Struct {
    field1: Vec<i32>,
    field2: Vec<i32>,
}

fn main() {
    let mut strct = Struct {
        field1: vec![1, 2, 3],
        field2: vec![2, 3, 4],
    };

    strct.field1.retain(|v| !strct.field2.contains(v));

    println!("{:?}", strct.field1);
}

给出以下错误:

error[E0502]: cannot borrow `strct.field1` as mutable because it is also borrowed as immutable
  --> src/main.rs:12:5
   |
12 |     strct.field1.retain(|v| !strct.field2.contains(v));
   |     ^^^^^^^^^^^^^------^---^^-----^^^^^^^^^^^^^^^^^^^^
   |     |            |      |    |
   |     |            |      |    first borrow occurs due to use of `strct` in closure
   |     |            |      immutable borrow …