Rust DList 实现双端队列？

Question

collections::dlist::DList看起来要实现collections::Deque ，它有一个 push_back 方法。

但是编译这个简单的程序:

extern crate collections;

fn main () {
    let mut c : collections::dlist::DList<int> = collections::dlist::DList::new();
    c.push_back(1);
}

给出这个错误信息

try.rs:5:4: 5:16 error: type `collections::dlist::DList<int>` does not implement any method in scope named `push_back`
try.rs:5    c.push_back(1);
              ^~~~~~~~~~~~

Answer 1

必须导入特征才能使其方法可用。文档中也指出了这一点:

DList implements the trait Deque. It should be imported with use collections::Deque.