That worked for do end but not fn -> end! 
I know it sounds so silly, but what happens is that if I type end myself, it triggers autocomplete, which then captures my up arrow keypress. So you have to press escape or something to get out of autocomplete, which also takes you out of insert mode. So then you have to press i again, then up, then tab. It’s many keypresses for something that happens all the time.
Also, if you just leave a block open without the corresponding end, then everything gets colored bright red cuz it’s a syntax error. Not only that, but indent just completely stops working.
See screenshot for an example. My cursor (which you can’t see because of other neovim related reasons) is on column 1, i.e. autoindent just completely fails.
The neovim ecosystem is moving fast, and this post is kind of outdated already. I’ll update the post later when I get more free time.
guilty! 
