[GHC] #7035: `deriving instance Generic (HsExpr Id)` raises panic

[GHC]

#7035: `deriving instance Generic (HsExpr Id)` raises panic
---------------------------------+------------------------------------------
  Reporter:  Daniel Schuessler   |          Owner:  dreixel         
      Type:  bug                 |         Status:  closed          
  Priority:  normal              |      Milestone:  7.8.1           
 Component:  Compiler            |        Version:  7.4.2           
Resolution:  duplicate           |       Keywords:                  
        Os:  Linux               |   Architecture:  Unknown/Multiple
   Failure:  Compile-time crash  |     Difficulty:  Unknown         
  Testcase:                      |      Blockedby:                  
  Blocking:                      |        Related:  7255            
---------------------------------+------------------------------------------
Changes (by dreixel):

  * status:  new => closed
  * resolution:  => duplicate
  * related:  => 7255


Comment:

 Already fixed in #7255.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7035#comment:4>
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