Haddock breaks when a module uses quasiquotes.

gistfile1.txt

$ haddock -o doc -h Main.hs Quasi.hs

During interactive linking, GHCi couldn't find the following symbol:
  Quasi_qq_closure
This may be due to you not asking GHCi to load extra object files,
archives or DLLs needed by your current session.  Restart GHCi, specifying
the missing library using the -L/path/to/object/dir and -lmissinglibname
flags, or simply by naming the relevant files on the GHCi command line.
Alternatively, this link failure might indicate a bug in GHCi.
If you suspect the latter, please send a bug report to:
  glasgow-haskell-bugs@haskell.org

Main.hs

{-# LANGUAGE QuasiQuotes #-}

import Quasi

f [$qq|test|] = True
f _ = False

main = do
    print [$qq|test|]
    print $ f [$qq|test|]
    print $ f [$qq|test 2|]

Quasi.hs

{-# LANGUAGE DeriveDataTypeable #-}
module Quasi (qq, Var (..)) where

import Data.Generics
import qualified Language.Haskell.TH as TH
import Language.Haskell.TH.Quote

data Var = Var String deriving (Data, Typeable, Show)

qq :: QuasiQuoter
qq = QuasiQuoter qqExp qqPat

qqExp :: String -> TH.ExpQ
qqExp s = dataToExpQ (const Nothing) (Var s)

qqPat :: String -> TH.PatQ
qqPat s = dataToPatQ (const Nothing) (Var s)