[GHC] #12966: GHC panics with forall and constraint

[GHC]

#12966: GHC panics with forall and constraint
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        Reporter:  xcmw              |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  wontfix           |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  typecheck/T12966
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Adding a test is good.  For comment:2 do I gather that you have done so?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12966#comment:3>
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