rust - Rust 引用书中的问题

Question

https://doc.rust-lang.org/reference/types/closure.html#capture-modes

struct SetVec {
    set: HashSet<u32>,
    vec: Vec<u32>
}

impl SetVec {
    fn populate(&mut self) {
        let vec = &mut self.vec;
        self.set.iter().for_each(|&n| {
            vec.push(n);
        })
    }
}

If, instead, the closure were to use self.vec directly, then it wouldattempt to capture self by mutable reference. But since self.set isalready borrowed to iterate over, the code would not compile.

引用书上说代码无法编译，但是代码可以编译。那为什么？

Answer 1

这在过去是正确的，但此后发生了变化，并且引用未更新。自 2021 版以来，closures capture disjoint fields .

参见 reference issue #1066 .