I installed coq and coqtail in my computer. According to this page:


Im now supposed to use the command


to launch the plugin. However, when I type ":CoqStart" the system responds: "E492: Not an editor command: CoqStart"

So, what should I do instead?


1 Answer 1


That error likely means either Coqtail wasn't installed correctly, it didn't load because of the file type, or it doesn't support your version of Vim/NeoVim.

To check for the first case, see if Coqtail is in your Vim runtime path (:echo &rtp). If not, double check that you didn't miss a step while installing with whatever package manager you're using (e.g., forgetting to do :PlugInstall with vim-plug). See https://github.com/whonore/Coqtail#installation-and-requirements for some options.

If it is installed, make sure the buffer you're editing has filetype=coq. This should be set automatically if you open a .v file, but you can also set it manually with :set ft=coq.

Finally, if everything is installed and you're editing a Coq file, check if g:coqtail#supported is 0. Coqtail requires Python 3.6 or newer and it will fail to load and print an error if your Vim/NeoVim installation doesn't have it.

  • $\begingroup$ Thank you very much. For some reason my Vim installation is defaulting ".v" files to "verilog" instead of coq. Once I changed the filetype, Coqtail launched correctly. I'll try to change it so that it defaults to the right file type. $\endgroup$
    – Raul Gomez
    Commented Mar 21, 2023 at 23:44

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