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I have a Haskell file on VIM with a Haskell-style comment block:

http://i.stack.imgur.com/5uKS2.png

When I select that comment block on visual mode...

http://i.stack.imgur.com/TFHWf.png

And press gq, I expected VIM to format my comment to something like:

http://i.stack.imgur.com/4nsgT.png

But instead, this is what VIM does:

http://i.stack.imgur.com/qn2Dw.png

How can I fix it?

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    It works on my gVim (version 7.4-798). What's the result of running :set ft? and :set comments?. What's your Vim version? Do you have :filetype plugin indent on in your vimrc ? – VanLaser Aug 10 '15 at 19:09
  • I don't have that, VanLaser. I actually have "filetype plugin on commented, I recall actively doing so for some reason I don't remember. set ft? gives haskell, and set comments gives comments=s1:/*,mb:*,ex:*/,://,b:#,:%,:XCOMM,n:>,fb:- (before Lithis's answer). – MaiaVictor Aug 10 '15 at 19:13
  • Yes, no wonder the comments aren't recognized ... :) – VanLaser Aug 10 '15 at 19:16
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    Okay I see the filetype plugin is what VIM uses for filetype based comments. – MaiaVictor Aug 10 '15 at 19:22
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:set comments+=:--

This appends :-- to the value of comments, which adds -- as a comment line indicator. The format of this option is described by :help format-comments.

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    The question is, I guess, why isn't it already there, in OP case? – VanLaser Aug 10 '15 at 19:09
  • @VanLaser I don't know, maybe my vimrc or existing plugins messed with it (if it was supposed to?) It solves the issue, though. Thank you all! – MaiaVictor Aug 10 '15 at 19:11

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