On: Learning Rust

[bjz_]

I've been using my own `rustup` script, but this is much nicer!

[sanderjd → bjz_]

I actually use it with a `rustup` alias, because homebrew-cask isn't great at upgrading nightlies:

    alias rustup='brew cask fetch --force rust cargo && brew cask install --force rust cargo && git -C ~/.vim/bundle/rust.vim pull'