如何使用特定版本的Rust？

Question

我知道目前有两个版本的Rust（ 2015和2018 ），我怎么能告诉cargo和rustc哪个我想用？

Answer 1

You can add the following to your Cargo.toml , it's documented on the edition 2018 guide :

[package]
edition = "2018"

---

If you directly use rustc you can use rustc --edition 2018 , it's documented with rustc --help -v command.

--edition 2015|2018
  Specify which edition of the compiler to use when
  compiling code.