[GHC] #1006: 'impossible' happened in reportNoInstance?

[GHC]

#1006: 'impossible' happened in reportNoInstance?
-------------------------------------+--------------------------------------
 Reporter:  SamB                     |          Owner:         
     Type:  bug                      |         Status:  new    
 Priority:  normal                   |      Milestone:         
Component:  Compiler (Type checker)  |        Version:  6.7    
 Severity:  normal                   |     Resolution:         
 Keywords:                           |     Difficulty:  Unknown
 Testcase:  tcfail171                |   Architecture:  Unknown
       Os:  Unknown                  |  
-------------------------------------+--------------------------------------
Changes (by simonpj):

  * testcase:  => tcfail171

Comment:

 I've fixed this.  Thanks for reporting it.

 tcfail171 tests

 Simon

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1006>
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