[GHC] #15240: GHCi's :doc doesn't find the documentation for some class methods

[GHC]

#15240: GHCi's :doc doesn't find the documentation for some class methods
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           Reporter:  sjakobi        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  GHCi           |           Version:  8.5
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Other
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 While `:doc` reliably finds the docs for classes like Foldable and Monad,
 it fails for some methods.

 {{{
 λ :doc return
  Inject a value into the monadic type.
 λ :doc foldr
 <has no documentation>
 λ :doc show
 <has no documentation>
 }}}

 So far I haven't been able to see a pattern there.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15240>
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