I made a quick script to rg FIXME in the rust repo and see if the issue has been closed.
Tada! gist A list of closed issues with cleanup work remeaning. Hopefully, lots of easy fixes.
Awesome. I think this should be a meta issue on github!
edit: and it now is: https://github.com/rust-lang/rust/issues/44366
Thanks! Now that I am awake I added some more context to the meta issue.