No, I meant just bare-bones rust tools. Let's not go into crates when it's about having a simple hello world working.
Can we a have a definitive answer along the lines:
"there's absolutely nothing stopping anyone from doing it themselves, not in rustc, not in llvm, not in jemalloc, etc"?
I'm afraid it's not going to be that simple - devoting 30 minutes on fast hardware to cross-compile such a target would've probably been done by someone just for laughs by now.
Slackware is one of the last distributions (or is it the last?) that cater to such old hardware which is why I used it as an example - I know this type of hardware is pretty irrelevant nowadays. (we're talking P3's and Athlons that could still be usable)