[GHC] #12584: Renamer is not applied properly to the expressions in declaration splices

[GHC]

#12584: Renamer is not applied properly to the expressions in declaration splices
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        Reporter:  Shayan-Najd       |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  high              |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2539
       Wiki Page:                    |
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Changes (by bgamari):

 * status:  new => patch
 * differential:   => Phab:D2539


Comment:

 The problem here is that `RnExpr.patSynErr` returns a `EWildPat`, which
 shouldn't appear in the AST post-renaming. See Phab:D2539 for one possible
 fix.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12584#comment:4>
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