[GHC] #13644: overloaded name used in record pattern matching leads to panic! (the 'impossible' happened) in ghc

[GHC]

#13644: overloaded name used in record pattern matching leads to panic!  (the
'impossible' happened) in ghc
-------------------------------------+-------------------------------------
        Reporter:  pjljvdlaar        |                Owner:  mpickering
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by mpickering):

 I put the test up on phab. https://phabricator.haskell.org/D3535

 The problem is in TcPat.find_field_ty but I can't see how to cleanly fix
 it.

 In the renamer we don't care yet whether a record selector is the right
 one for the data constructor. When we check in the type checker, all the
 verify is that the `OccName` of the selector is one of the field labels of
 the right data constructor. We don't compare `Name`s at all like we should
 do because of something to do with ORF.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13644#comment:6>
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