[GHC] #7280: zonkQuantifiedTyVar panic

[GHC]

#7280: zonkQuantifiedTyVar panic
-------------------------------------------------+--------------------------
  Reporter:  rl                                  |          Owner:                  
      Type:  bug                                 |         Status:  closed          
  Priority:  normal                              |      Milestone:                  
 Component:  Compiler                            |        Version:  7.6.1           
Resolution:  fixed                               |       Keywords:                  
        Os:  Unknown/Multiple                    |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown                        |     Difficulty:  Unknown         
  Testcase:  indexed-types/should_compile/T7280  |      Blockedby:                  
  Blocking:                                      |        Related:                  
-------------------------------------------------+--------------------------
Changes (by simonpj):

  * status:  new => closed
  * difficulty:  => Unknown
  * resolution:  => fixed
  * testcase:  => indexed-types/should_compile/T7280


Comment:

 Thanks for the report.  It turns out to be a bug in the branch only so
 I've fixed it there
 {{{
 commit 439ddf9182489c1c4f03ff9eecb460796be829fe
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Mon Oct 8 08:33:41 2012 +0100

     Fix Trac #7280 by zonking the final_quant_candidates in simplifyInfer

     This fix is only needed on the branch; HEAD already works differently
     (and correctly).

  compiler/typecheck/TcSimplify.lhs |    2 ++
  1 file changed, 2 insertions(+)
 }}}
 I've added a regression test to HEAD.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7280#comment:1>
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