I've opened a new upstream PR (bazelbuild/platforms#97) since the original one seems to be abandoned.

That PR is not really abandoned, it has approval and is waiting for someone on the Bazel team to merge it (I'm the person who did both PRs).

I'll rebase this either this week or early next one, then we can merge it now that the platform constraint has been merged upstream.

I can't figure out how to use rules_rust with this change in: it completely breaks bazel 8.0.1 with

 no such target '@@platforms//os:uefi': target 'uefi' not declared in package 'os'

message, despite me adding fresh "platforms" http_archive repository according to platforms release notes. It seems that bazel insits on using built-in platforms, which makes new versions of rules_rust not usable until bazel incorporates uefi platform changes into the release.

I was able to overcome this by adding "platforms" to MODULE.bazel instead. Sorry for the noise.