打印切片矢量導致“大小不滿意”

Question

我正在嘗試切片矢量並在Rust中同時打印它。 這是我的代碼：

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

錯誤：

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

你需要使用一個參考; 它在Rust 1.13中對我有用。

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