sass-lint, why don't you just work?

Tonight I came up with this, to see if I could have some saner error reporting (other than standard sass complaining about non-consequential stuff) in my stylesheets.

Results were a bit lackluster, as the following image shows (plain sass works fine, though):

Am I missing something obvious, or it’s just that sass-lint is works this way?

(BTW, this gist is not entirely correct, but that’s the best I have…for now. If time and patience allow, hopefully I’ll submit a patch to flycheck when I get this working)