Summary: The upstream repo moved to GitHub.
< Official site: [http://projects.haskell.org/haskellmode-emacs/]
> Official site: [https://github.com/haskell/haskell-mode]
Official site: 
Haskell-mode 2.8 has different setup from earlier versions. Make sure to read the README and check it against your .emacs.
The Haskell wiki has an interesting note on using mmm-mode (from MultipleModes) so that you can write your scholarly paper while still hacking. []