Hello! I made mm2 deprecated because of collision with other names (see e. g.: MM2 | | | | MM2 Mm2 is a short form for square megameter, also an international unit of area. | | | ). Now its successor is named mmsyn2 (mmsyn2: The library that can be used for optimization of multiple (Ord a) => a -> b transformations | | | | mmsyn2: The library that can be used for optimization of multiple (Ord a... Install via `cabal install mmsyn2`. | | | ). I made some optimization improvements while benchmark testing, but the last one is not yet complete and ready at the moment. Therefore, I left the documentation (except some minor corrections) and work on testing.  Best regards,Oleksandr Zhabenko. вівторок, 24 вересня 2019 р., 22:37:03 GMT+3, Олександр Жабенко <olexandr576@yahoo.com> написав: Hello! I made mm2 deprecated because of collision with other names (see e. g.: MM2 | | | | MM2 Mm2 is a short form for square megameter, also an international unit of area. | | | ). Now its successor is named mmsyn2 (mmsyn2: The library that can be used for optimization of multiple (Ord a) => a -> b transformations | | | | mmsyn2: The library that can be used for optimization of multiple (Ord a... Install via `cabal install mmsyn2`. | | | ). I made some optimization improvements while benchmark testing, but the last one is not yet complete and ready at the moment. Therefore, I left the documentation (except some minor corrections) and work on testing.  Best regards,Oleksandr Zhabenko.