I don't think it's really fair to talk about pre-1.0 language changes -- by definition, being pre-1.0 typically implies a lack of stability. One of the major ed

I don't think it's really fair to talk about pre-1.0 language changes -- by definition, being pre-1.0 typically implies a lack of stability. One of the major editions you mention is the 1.0 release. So, there has been 1 new edition since 1.0, and, as the parent comment says, the only really groundbreaking change since 1.0 is the stabilization of async support. Other changes, such as the `dyn` keyword and match ergonomics are mostly superficial, and things such as NLL and additional lifetime elisions are just simple quality of life improvements that don't fundamentally change the language.