The platform `problem` shouldn't be a problem, because you wouldn't use ruby outside of Linux, Windows, Mac, FreeBSD, OpenBSD and Rust has support for more than that[1]. Backwards compatibility isn't a concert either, Rust promised and kept it for some years (after 1.6).
The real problem is whether or not the expense of porting it is justified. Taking a look at the git repository of it (before it was merged into upstream), I understand why they want to rewrite it in Rust, the repository looks like a complete mess. I don't know if they want to use an existing JIT codegen like LLVM or Cranelift, or their own.
The real problem is whether or not the expense of porting it is justified. Taking a look at the git repository of it (before it was merged into upstream), I understand why they want to rewrite it in Rust, the repository looks like a complete mess. I don't know if they want to use an existing JIT codegen like LLVM or Cranelift, or their own.