Prevent using or calling uninstalled packages

[Compro-Prasad]

Like flycheck. I haven't installed flycheck but this package always calls it which I don't like. If not available either offer to install it or don't try to enable it.

[brotzeit]

Yeah, my solution still doesn't work for every case. But I'm a little confused since flycheck shouldn't be installed by rustic. The rustic flycheck file will only be required when flycheck is loaded. And you shouldn't be offered to install it.
Are you absolutely sure you mean flycheck ?
If so please try if you get the same issue with a minimal config and describe your steps.

Regarding eglot and lsp-mode, I have to fix automatic requiring.

[Compro-Prasad]

I mean that flycheck-mode is called after opening any rust file. So, the problem I see is the find-file-hook.

[brotzeit]

Are you sure that flycheck wasn't installed by some package as dependency ? I will change this, but I can't explain why rustic would call flycheck if it isn't already installed.

[Compro-Prasad]

I am using straight.el as package manager. It pulls the package metadata from melpa AFAIK. If it cant find flycheck as a dependency then it wont pull it.

But it has pulled it. I think I will look into it then report again later.