[GHC] #8919: Why is xhtml library installed but not exported to users?

[GHC]

#8919: Why is xhtml library installed but not exported to users?
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        Reporter:  simons            |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:  7.8.3
       Component:  Build System      |          Version:  7.8.2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  Other             |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by hvr):

 The same applies to `terminfo-0.4.0.0` and `haskeline-0.7.1.2` which have
 only the DSOs installed (and no interface files).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8919#comment:3>
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