What parts of the language have been changing? And maybe to reduce the scope of that question a bit: are there any specific features that need to be solidified first before someone should bother learning Rust?
I am no language expert by any means, but I haven't had much trouble picking up Rust. In fact it's been a lot of fun. I've mostly used the official documentation [1](tutorial, manual, core/std reference). Sometimes I will have to look at some unit tests on the rust github source to see how something is used.
I started playing with it when 0.5 came out, and the changes that I've seen when I went with a pre-0.6 build are not what I would consider major. There are many of them, but most are either relatively minor syntactic issues or in darker corners of the language that I haven't needed to touch yet.
