Hi Everyone,

mtl-2.3.1-rc1 (https://github.com/haskell/mtl/releases/tag/v2.3.1-rc1) is up on Github. We'll give this a 2 week window for issues relating to the changelog, and then do a release. Please review and upgrade if you're interested. Backported is also a migration doc for people interested in migrating to mtl-2.3. You can find it in the repo. 

Special thanks to Koz and everyone else who contributed. 

Cheers,

E