https://crates.io/crates/rustfmt
https://docs.rs/rustfmt
https://github.com/rust-lang-nursery/rustfmt

https://crates.io/crates/rustfmt-nightly

http://ncameron.org/blog/rustfmt-changes/
https://medium.com/@fredrikanderzon/rust-code-style-and-rustfmt-4f69fbd87c18