[GHC] #5315: panic in idInfoToAmode with -O

[GHC]

#5315: panic in idInfoToAmode with -O
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    Reporter:  mikhail.vorozhtsov  |        Owner:                    
        Type:  bug                 |       Status:  new               
    Priority:  high                |    Milestone:  7.2.1             
   Component:  Compiler            |      Version:  7.1               
    Keywords:                      |     Testcase:                    
   Blockedby:                      |   Difficulty:                    
          Os:  Unknown/Multiple    |     Blocking:                    
Architecture:  Unknown/Multiple    |      Failure:  Compile-time crash
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Comment(by simonpj@…):

 {{{
 commit ce8c84a76d0a19ff56d4c4e58744776fda2044bd
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Fri Jul 15 11:49:38 2011 +0100

     Use varToCoreExpr rather than Var (fixes #5315)

     A coercion variable in a term must be wrapped in a coercion!
     (Led to lint errors.)
 }}}

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5315#comment:3>
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