TAB does not work in Haskell mode in Ubuntu 14.04

[Peter Selinger]

I just upgraded a number of systems to Ubuntu 14.04, and it seems that the Emacs Haskell mode is no longer working correctly.
For example:

f :: Int -> Int
f x = y where
[TAB]

When pressing TAB, instead of going through the indentation cycle, I get a second window displaying information about haskell-mode-hook:

--------------------------
haskell-mode-hook is a variable defined in `haskell-mode.el'.
Its value is nil

  This variable may be risky if used as a file-local variable.

Documentation:
Hook run after entering `haskell-mode'.

Some of the supported modules that can be activated via this hook:

   `haskell-decl-scan', Graeme E Moss
     Scans top-level declarations, and places them in a menu.

[AND SO ON]
---------------------------

To reproduce: just type TAB anywhere in a Haskell source file.

Version: haskell-mode 13.10-2

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Konrad Voelkel (konradvoelkel)]

After using emacs customize to add '(haskell-mode-hook (quote (turn-on-haskell-indentation))) to the .emacs file and closing all haskell buffers, rebooting emacs and opening a haskell file again, I no longer have this problem.

It would probably be a sensible default to have some haskell-mode-hook configured right after installing haskell-mode.

Hope this helps others, too!

[Peter Selinger (selinger)]

Thanks. What you wrote didn't work for me as written, but it enabled me to figure out what to do. I put this in my .emacs file:

(setq haskell-mode-hook (quote (turn-on-haskell-indentation)))

and now it works fine for me. I still think it is a bug that such manual configuation is required; this should just happen automatically, as it did prior to 14.04.