It's been backed up behind a giant rewrite of more or less the entire trait system. This has been an enormous, many-year project that's been years late in shipping. The issue isn't so much the difficulty of the problem as the development hell that Chalk (and traits-next) has been stuck in for years.
Is there anything we users can do to help get that project out of development hell? Besides not constantly getting the developers down, and even burning them out, with uninformed complaints and criticisms, which is something I try not to do.
> If it's been known since 2015 and not fixed, that's pretty suggestive.
That means nothing. In Rust, "everyone is a volunteer" and you're not allowed to expect things to be fixed unless you do it yourself - so the fact that this hasn't been fixed is simply an artifact of the culture, not necessarily the difficulty of the problem.