Sigh.. I was hoping to work on this more, but haskell-language-server isn't working anymore in my local copy of this repo.

I got haskell-language-server to work again. However, I'm going to close this for the time being for two reasons.

First, I'll be out for the next two weeks or so on vacation-related things. So, I'm not going to get to this anytime soon.

Second, implementing this properly will likely touch the type checker, which I'm still unfamiliar with. So, when I do get back, I'd rather focus my efforts on understanding the compiler deeply, and then continue my efforts here. I will reopen once I've made progress or have further questions about how to proceed.