rustfmt is nearing a 1.0 release with a stability guarantee for frozen formatting! https://twitter.com/nick_r_cameron/status/1029498333750935552
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Programming in Rust has become so much easier than when I first started. Not only the continuing polish of the core tools (e.g. error message clarity, rustfmt is bundled now) but also the increasing breadth and quality of the libraries available!
Emacs package of the day: emacs-rustfmt: https://github.com/fbergroth/emacs-rustfmt . Automatically formatting code on save is a revelation.