The previous draft spec wasn't able to build rust with the official 0.6 sources. The spec file is now updated and you can build your own rust package using:
$ curl -O https://raw.github.com/fabiand/rust-spec/master/rust.spec $ nice ionice rpmbuild --noclean -ba -v rust.spec
It is assumed that you've got a working fedora-package setup and an internet connection.
Changes are mainly that
chrpathis used to remove rpaths from files. Rust is still using it's own libuv and llvm.