Stuff being either in Cask or Homebrew is just terrible. Homebrew also has a versions tap. Those two projects should combine efforts and remove ambiguity.
I 100% agree with you. It took me like an hour to figure out where I thought it made sense to put rust-nightly, and I'm still not really sure I did it right. But it works and is way better than the morning compilation cronjob I used to use.
I agree, it works, but we need to keep pressing those guys... or contribute. Cask still doesn't have reinstall/upgrade. As far as I know, Homebrew can't upgrade packages with head versions, and, worst pain of all - Homebrew doesn't support Yosemite or any unreleased OS X version. Being a tool for developers primarily, all the above are must-haves!