Add .rustfmt.toml, specify edition = "2021" #745
Merged
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There are two common ways to run rustfmt:
$ cargo fmt
$ rustfmt
In the first case, Cargo.toml will be used to configure rustfmt. In the second case, Cargo.toml won't be used and rustfmt will assume certain defaults. Specifically, it will default to Rust 2015 edition which for the quick-xml project results in errors like:
[E0670]: async fn is not permitted in Rust 2015
One of the scenarios when rustfmt is called instead of cargo fmt is "rustic" mode in emacs. The developers of "rustic" mode ask to configure .rustfmt.toml:
See: https://github.com/brotzeit/rustic?tab=readme-ov-file#edition-2018