How do I use a specific edition of Rust?

Question

I know there are currently two editions of Rust (2015 and 2018), how can I tell cargo and rustc which one I want to use?

See also: [Rust error: borrow occurs after drop a mutable borrow](https://stackoverflow.com/a/55285391/493729) — Peter Hall, Apr 03 '19 at 23:43

score 4 · Accepted Answer · answered Apr 03 '19 at 21:16

4

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.

answered Apr 03 '19 at 21:16

Stargateur

Currently, if `edition` is not set in `Cargo.toml`, it will default to `2015`. – so61pi Apr 04 '19 at 16:03

1 Answers1