[steveklabnik]

I am not aware of anyone actively working on them, though I am also not on the compiler team.

Looks like someone who cares about this needs to step up! You can make it happen sooner than later. It is one of the best things about open source.

[candied_scarf]

except it needs someone very experienced with rust and compilers to fix which isnt me. even then if its ignored now whats to say a pr wont be too