[GHC] #11517: ghc -haddock fails to parse doc comments in closed type families

[GHC]

#11517: ghc -haddock fails to parse doc comments in closed type families
-------------------------------------+-------------------------------------
           Reporter:  kanetw         |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.10.3
  (Parser)                           |
           Keywords:  Haddock        |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 GHC with -haddock fails to parse the following program:
 {{{#!hs
 {-# LANGUAGE TypeFamilies #-}
 module Bug where

 type family Closed a where
   -- |This comment fails to parse
   Closed Int = Bool
 }}}

 {{{
 ghc -haddock Bug.hs
 [1 of 1] Compiling Bug              ( Bug.hs, Bug.o )

 Bug.hs:5:3: parse error on input ‘-- |This comment fails to parse’
 }}}

 (tested with 7.10.3 and an slightly out-of-date HEAD)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11517>
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