Each time I open a .toml file I'm asked in the minibuffer:

Support for toml-mode requires installation of layer rust, do you want to install it? (y or n) n

How can I stop that question?

1 Answer 1


You have to learn how to ask Emacs questions.

I didn't know the answer to your question when I first read it. However, Emacs revealed the answer after I asked it some questions.

  • Usually, behaviors are controlled by variables.
  • To ask Emacs about variables, you hit C-h v.
    • The Spacemacs alternative is SPC h d v. (Same thing.)
  • Then I typed "spacemacs installation", and I got an autocompleted list of some likely candidates.
    • dotspacemacs-enable-lazy-installation
    • dotspacemacs-ask-for-lazy-installation

After reading their docstrings, I figured out that you have to do this:

(setq dotspacemacs-ask-for-lazy-installation nil)

Remember to ask Emacs first.

The more you learn how to ask Emacs questions about itself, the faster you'll get good at it. Here are a few more to commit to memory.

  • C-h f :: describe function
  • C-h k :: describe key binding
  • M-x ielm :: start an Elisp REPL

Emacs can tell you so much about itself if you ask.

  • 1
    Quite valuable. Thank you.
    – jjk
    Commented Sep 13, 2023 at 8:29
  • Nice answer! One twist is to be able to disable lazy installation prompt for a specific layer but I guess that might not be possible? Commented Sep 13, 2023 at 10:10
  • @JurajMartinka That seems a little too specific to be controlled via configuration. Maybe something extremely hacky like making Emacs forget that toml-mode even exists could do it, but I feel like it's not worth the trouble.
    – g-gundam
    Commented Sep 14, 2023 at 15:39

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