emerge @rust-rebuild no longer works after virtual/rust was removed in favor of slotting. It simply returns nothing now. This means you have to run equery d dev-lang/rust and then list all of the packages to rebuild by hand, which is inconvenient. Is this intentional behavior? Is there another way to do it now? I didn't see anything about it in the news.
This ended up being covered in bug 906044. It's fixed in (not yet released) portage. *** This bug has been marked as a duplicate of bug 906044 ***
(In reply to Sam James from comment #1) > This ended up being covered in bug 906044. It's fixed in (not yet released) > portage. > > *** This bug has been marked as a duplicate of bug 906044 *** Got it, thanks.