Rust in now packaged for Fedora 
Just one command and you get started
sudo dnf install rust
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How do new compilers get inside a distro? They need somebody to manually add the binary, right? So it’s the trusting trust problem.
Great that Rust landed since newer versions of Firefox need it in order to build 
Most distributions don’t add binaries, they build from source. That’s what they do with Rust too. What you get when you install Rust with your package manager is of course a binary (unless you use Gentoo :)), so yes you are supposed to trust your distribution.
Each distribution has different kind of building process. So for instance on Fedora, that I’m using, there is a central build system and packages get through a review process, so at least you don’t necessarily have to trust the package maintainer.
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Ooooohhh… I just figured it out: rustc is written in C++, not in Rust. That’s why it works to add it from source.
I thought that rustc is also written in Rust 
??? rustc is written in Rust, only LLVM is in C++.
Rust can now be built using older stable versions of Rust, so they import one state and then compile their new rustc’s using the old package versions.
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Aaaa… I see. So basically they grab the newest Rust that need only C++, compile that with the LLVM and Clang from the repos or with GCC. And after that they compile rustc with the old rustc.