This isn't a really important question, but why the name Cannoli? I feel like you missed an opportunity here to call it "PycRust". (c standing for "compiled to" of course)
Do you plan to support this down the line? I feel like compilers that compile down to Rust could become really good tools depending on how the popularity of the language goes.
I feel like the postfix is something languages lose the bigger they get, I hope this happens to rust too.
[1]: https://en.wikipedia.org/wiki/Pike_(programming_language) †: I have a particular fondness for Pike, because it's derived from the first programming language I ever used: LPC. Anyone else an LPC hacker?