Install emacs racer23.02.21

Installation

You will need to use a nightly version of rust. If you're using rustup, run

$ rustup toolchain add nightly

Install Racer and download the source code of Rust:

$ rustup component add rust-src
    $ cargo +nightly install racer

Allow Emacs to install packages from MELPA:

(require 'package)
    (add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/"))

Install the Emacs package for Racer: M-x package-install RET racer RET

Configure Emacs to activate racer when rust-mode starts:

(add-hook 'rust-mode-hook #'racer-mode)
    (add-hook 'racer-mode-hook #'eldoc-mode)

For completions, install company with M-x package-install RET company RET. A sample configuration:

(add-hook 'racer-mode-hook #'company-mode)

(require 'rust-mode)
    (define-key rust-mode-map (kbd "TAB") #'company-indent-or-complete-common)
    (setq company-tooltip-align-annotations t)

For automatic completions, customize company-idle-delay and company-minimum-prefix-length.

Racer process may be slow to respond for instance when indexing. You can customize racer-command-timeout and racer-eldoc-timeout to avoid rendering your Emacs session unresponsive. Eldoc timeout should be on the lower side and defaults to 0.5 seconds. You can probably tweak it down on a fast machine. Timeout of nil will wait indefinitely.

https://github.com/racer-rust/emacs-racer

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Install emacs racer23.02.21

Information Epoch 1745873169