[GHC] #11970: Simplify Parent for patten synonyms

[GHC]

#11970: Simplify Parent for patten synonyms
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        Reporter:  simonpj           |                Owner:  mpickering
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 This is very similar to
 {{{
 import M
 import N
 foo = T { f = 3 }
 }}}
 where we disambiguate 'f' (via `lookupSubBndrOcc`) to the `f` that comes
 from `T`.  Can't we do ''exactly'' the same for `T(f)` in an export list?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11970#comment:10>
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