I'd like to see this change land in F28!
Anyway, I think there is a showstopper:
* Fedora Packaging guidelines demand packages bundle no dependencies (e.g. libraries, or
in Rust's case crates). This is a good choice in my opinion.
* Rust currently has no ABI definition compatible over different versions of the rust
compiler. As a result, every time a new compiler is released it will also require *ALL*
rust packages to be rebuild. See
https://github.com/rust-lang/rfcs/issues/600 for details
and discussion.
* To get a sane update strategy, it is critical that not too much packages are involved in
rebuilds. Consider a CVE in openssl: Luckily we can rebuild openssl (plus its subpackages)
and ship it. No need to rebuild every application that uses openssl or uses another
package which uses openssl.
As far as I understand, these 3 points are conflicting right now. Either Rust gets an ABI
or we need to give up one of the other two principles, which I highly recommend not to
do.
Disclaimer: I'm no Rust expert, nor am I an ABI expert, so I might be completely wrong
about this.