Hi,
I have setup a "rustup" tool on Toolforge that contains the latest Rust toolchain for use by other tools so it doesn't need to be installed individually in each tool.
Documentation on how to use it in your tool is available at https://wikitech.wikimedia.org/wiki/Tool:Rustup, all you have to do is add two lines to your tool's ~/.profile.
If you need an older version or some other components, let me know and we can install it.
Hopefully this makes developing Rust tools just a bit easier :)
-- Legoktm