小编ZyS*_*ZyS的帖子

最小的例子是这样的（Playground）：

#[derive(Debug)]
struct Node {
    id: usize,
}

fn main() {
    let mut node = Node { id: 0 };
    let mut lastnode = &mut node;
    let mut last = lastnode; // move
    (*last).id = 1;
    println!("{:?}", last);
    //println!("{:?}", lastnode);

    let mut node2 = Node { id: 2 };
    lastnode = &mut node2;
    last = lastnode; // doesn't move to "last"
    println!("{:p}", last); // "last" and "lastnode" point to the same address
    println!("{:p}", lastnode);
}

为什么第一个会last = …