打印切片矢量导致"大小不满意"

Question

我正在尝试切片矢量并在Rust中同时打印它.这是我的代码:

fn main() {
    let a = vec![1, 2, 3, 4];
    println!("{:?}", a[1..2]);
}

错误:

error[E0277]: the trait bound `[{integer}]: std::marker::Sized` is not satisfied
 --> src/main.rs:6:5
  |
6 |     println!("{:?}", a[1..3]);
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ trait `[{integer}]: std::marker::Sized` not satisfied
  |
  = note: `[{integer}]` does not have a constant size known at compile-time
  = note: required by `std::fmt::ArgumentV1::new`
  = note: this error originates in a macro outside of the current crate

如何打印此切片矢量？

Answer 1

你需要使用一个参考; 它在Rust 1.13中对我有用.

println!("{:?}", &a[1..3]);