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I use haskellmode-vim and when I have a buffer open which is has the haskell filetype, invoking :Ack! always gives an empty quickfix window, even though the same query returns results when run from the shell prompt.
Here is a diff on ":set all" output between a plain buffer (where :Ack works as expected) and a buffer with the haskell filetype: https://gist.github.com/1688263
Sorry for filing this as an issue, I'm just out of ideas on how to debug it and could use some help with that. My whole vim config is available at https://github.com/arnar/vim-config
The cause of the problem is the following line in .vimrc. Not sure yet how to fix it. Commenting out this line makes Ack work, but then disables using most of the functionality of haskell mode.
au Bufenter *.hs compiler ghc
haskellmode-vim redefines "shellpile" varialbe, so you need to fix ack.vim:
" workaround for haskellvim
silent execute a:cmd . " " . escape(l:grepargs, '|')