Question 1

How do I set up racer.el in Emacs for Rust development?

Accepted Answer

Install nightly Rust with rustup, add rust-src, install racer via cargo, configure MELPA in Emacs, and set up hooks for rust-mode and company-mode as detailed in the installation steps, with sample code provided in the README.

Question 2

Why isn't racer.el completing Rust macros in my code?

Accepted Answer

Racer.el cannot complete macros because of a backend limitation in Racer itself, as noted in the README. You'll need to use other tools or handle macro completion manually for now.

Question 3

Racer.el vs Rust Analyzer in Emacs: which is better?

Accepted Answer

Racer.el is based on the older Racer tool and integrates well with Emacs, but Rust Analyzer is more modern, feature-rich, and actively maintained. For new projects, Rust Analyzer with lsp-mode might be preferable, though racer.el works for existing setups.

Question 4

How can I make racer.el completions faster in Emacs?

Accepted Answer

Adjust the racer-command-timeout and racer-eldoc-timeout settings to lower values on fast machines, or tweak company-idle-delay for less frequent completions, as suggested in the configuration tips in the README.

Question 5

Can I use racer.el with other completion frameworks besides company-mode?

Accepted Answer

Yes, racer.el provides basic completion functions that can integrate with other frameworks, but the README focuses on company-mode for optimal experience, so you may need additional configuration for alternatives.

Question 6

What does racer-debug show when things break?

Accepted Answer

Racer-debug displays the exact command executed by Racer and the output returned, helping identify issues like incorrect paths or timeouts, useful for troubleshooting when completions or navigation fail.

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