To be clear: I spent about half an hour working on updating things for head Rust. But when a language changes as much as Rust does, at some point, if you haven't kept up with it, it's basically impossible to update, it's simply easier to nuke it and start all over. This is why we have always recommended that people use the nightlies rather than the releases, because even upgrading per-point release is quite difficult. Not only that, since it's unclear which version of Rust this even compiles with, it's not as if I could install an old Rust and submit particular, concrete improvements for a Rust of that vintage. Starting over from scratch _is_ a concrete improvement, because it's the actual best path to moving forward in this particular case.

Have I mentioned how much I can't wait until 1.0.0 actually ships?