tracking issue for documenting chalk and the trait system

[nikomatsakis]

We have some great docs on the trait system already (if I do say so myself 😉) but there's lots of room for improvement. This issue exists to track ideas and try to stay organized.

• Update rustc guide with new rules for GATs (cc @tmandry, @scalexm)

[mark-i-m]

Might be good to link to this talk by @sunjay somewhere: https://www.youtube.com/watch?v=rZqS4bLPL24

It's a great intro :)

[mark-i-m]

This thread doesn't seem to be very useful, so I will close it to keep the tracker clean.