A while back I posted to announce we were enabling the use of #rust as a development language within @thunderbird

Pleased to say that we've now landed support, and as of today it's possible to write new libraries and xpcom components using #rustlang, as part of the libxul build!

hg.mozilla.org/comm-central/re…

Don't worry, we're not about to "RIIR" - this is enabling new code next year to supercharge the backend architecture for your favourite mail client.