rust/compiler
bors f8ab56bf32 Auto merge of #79576 - m-ou-se:2021, r=Mark-Simulacrum
Add edition 2021.

🎆 Happy new ~~year~~ Rust. 🍾

This adds --edition=2021, and updates suggestions about 2018 to say "2018 *or later*".

Related Cargo PR: https://github.com/rust-lang/cargo/pull/8922

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Edit: This adds the new edition as *unstable*. Without `-Z unstable-options`, `--edition=2021` results in:
```
$ rustc --edition=2021
error: edition 2021 is unstable and only available with -Z unstable-options.
```
2021-01-01 03:41:31 +00:00
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