Let's setup Emacs for Rust development, shall we ?

rust-mode

rust-mode (in MELPA) offers syntax highlighted and code formatting.

In Debian testing and unstable you can also install it with apt install elpa-rust-mode (but the MELPA way is prefered).

Code formatting with rustfmv

Formatting is also provided by this mode. If you want auto formatting everytime you save a buffer, put this in your Init File:

(setq rust-format-on-save t)