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* rustfmt install instruction gotcha rustfmt stopped working for me. It turns out people started having trouble with this last year already https://github.com/rust-lang-nursery/rustfmt/issues/2304 * rustfmt on a single file now works! Secrets inside After `rustup component add rustfmt-preview` I get rustfmt as a command in my terminal. `rustfmt --help` reveals --write-mode [replace|overwrite|display|plain|diff|coverage|checkstyle] and we've been using the default which is either `overwrite` or `replace` (depending on rustfmt version) and this was changing a bunch of files and a messed up workflow. * Newcomer-friendly explanation how to use `rustfmt`